Scott Bader | Composites | Gelcoats | Resins | Adhesives | Scott Bader
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Instruction Manual for SCOTT BADER models including: VE 679PA Vinyl Ester Resin, VE 679PA, Vinyl Ester Resin, Ester Resin, Resin
Crystic VE 679PA | Vinyl Ester Resin | Scott Bader | Scott Bader scott-bader-marine-guide-english
Crestomer 1186PA Structural Adhesive | Scott Bader | Scott Bader
File Info : application/pdf, 13 Pages, 1.87MB
DocumentDocumentWHY SCOTT BADER? MATCHED COMPOSITE AND ADHESIVE SYSTEMS Complete solutions for building world-class boats, with market leading quality and performance. RENOWNED TECHNICAL SUPPORT With over 70 years of marine expertise, our experts are on hand to support you every step of the way. Scan for our marine page TRUSTED AROUND THE WORLD With long-standing partnerships, we are trusted by the world's leading boatbuilders. 2 MARINE PRODUCT GUIDE WELCOME TO MARINE TECHNOLOGY EXCELLENCE Scott Bader has been the undisputed expert in marine technology for 70 years and continues to drive future innovations today. We pioneered the use of fibre reinforced plastic (FRP) in the marine industry and it was a Scott Bader resin that was used in the first ever composite boat in 1951 the Tod 12 Dinghy1. CONTENTS Marine products and applications 4 Crystic® 8 Crestamould® 10 Crystic® GC LS 30PA Excel 12 Resins 14 Crestomer® 16 Crestafix® 18 Crestabond® 20 Troubleshooting 22 1 http://www.cvrda.org/dinghydata/tod-12ft/ SCOTTBADER.COM 3 MARINE PRODUCTS AND APPLICATIONS Small fixings Crestomer® Advantage cartridges Crestabond® M1 & M7 series cartridges Metal to GRP Closed mould infusion resins Crystic® 701PA Crystic® 703PA Crystic® VE679-03PA Hand lay-up laminating resins - styrene control Crystic® 2 Series LSE Crystic® LS 451PA Engine room protection Fire protection: Crystic® Fireguard Crystic® GSC1001PA Engine bed stiffeners and stringer bonding Crestomer® 115*PA series Crestafix® 621CC series Crestafix® 630PA Deck to hull bonding Crestomer® 115*PA series Crestafix® 621CC series Crestafix® 630PA| Crestomer® Advantage cartridges Crestabond® M1 & M7 series Core bonding Crestomer® 1196PA Crestafix® 90-84PA Crestafix® B72R None - infused hulls with integral cores don't need a core bonding adhesive 4 MARINE PRODUCT GUIDE Gelcoats for weather and blister resistance Spray LS 3OPA Excel Brush LS 31PA excel Brush: Crystic® LS 88PA Spray: Crystic® LS 97PA Skin coats for surface finish and water resistance Crystic® VE690PA Crystic® VE679PA Crystic® VE671PAT Crystic® 489PA Interior finishing Fairing and corner filling: Crestafix® F26R Internal surfaces: Crystic® TC506PA, TC507PA Bulkhead bonding Crestomer® 115*PA series Diesel resistant bonding Crestafix® 630PA Crestomer® 1152PA Crestabond® Fuel storage safety Laminates for diesel resistance: Crystic® VE690PA Crystic® VE661PA Crystic® VE661-03PA and VE679-03PA SCOTTBADER.COM 5 QUALITY ASSURED Before a product goes to market it will have completed Scott Bader's rigorous development programme. All new gelcoats are tested under the most extreme conditions, including 12 months continuous exposure in Florida in order to satisfy the accelerated weather programs and blistering tests. Once tested, each batch of gelcoat manufactured has to pass stringent quality control tests that ensure consistent quality, colour, surface finish and handling. Products are then approved by the key industry standards as appropriate, such as Lloyds, ClassNK, DNV-GL and RINA. 6 MARINE PRODUCT GUIDE HEAR WHAT CUSTOMERS SAY "Scott Bader's technical team are always quick to respond and willing to help. Their products are adapted to suit the environment (heat exposed location) in which we work, from resins to bonding pastes, their products are durable and easily applicable with straight forward instructions." Talia Maggi Vice President of the Commercial Division, Gulf Craft "Scott Bader are an integral partner for Princess Yachts. We value the high quality of the materials supplied and the responsive technical support we receive. Their advice and technical recommendations, based on a detailed understanding of our manufacturing process, helps us to optimise our production lines from a chemistry standpoint whilst maintaining the high level of quality Princess Yachts is renowned for. Scott Bader, with their unique Commonwealth ownership structure, excellent products and focus on innovation, give us full confidence in both their products and our long-standing relationship." Paul Mackenzie Chief Operating Officer, Princess Yachts "We've a great working relationship with Scott Bader for over 20 years, helping us to offer innovative, market leading ribs to our customers." Rudie Garton, Technical Manager, Ribeye Boats SCOTTBADER.COM 7 CRYSTIC® MATCHED PERFORMANCE SYSTEMS If you're looking for the ultimate in aesthetics and blistering resistance then look no further! After decades of commercial use, the benefits of using Crystic® Matched Performance Systems have been shown to extend beyond eliminating blistering: · Exceptional aesthetics · Improved strength and rigidity · Greater strength to weight ratios · Better fuel economy and performance · Superior water resistance Optimum laminate construction Resin and fibreglass laminate Skin coat Gelcoat GELCOAT SKIN COAT Spray application LS 30PA Excel VE 690PA 489PA LS 97PA VE 679PA Hand lay-up LS 31PA Excel VE 690PA LS 88PA 489PA 65PA Closed mould LS 30PA Excel LS 31PA Excel LS 88PA LS 97PA 65PA VE 679PA VE 690PA 489PA VE 679PA RESIN 2.420PA LS 451PA 2.406PA 2.446PA LS 451PA 2.420PA LS 451PA 2.406PA 2.446PA LS 451PA 701PA 702PA 703PA VE 679-03PA CHECK OUT THE WHOLE CRYSTIC® PRODUCT RANGE Scott Bader has an extensive gelcoat, resin and pigment paste range, ask your local Scott Bader contact for more details. 8 MARINE PRODUCT GUIDE Crystic® matched performance range overview DESCRIPTION VISCOSITY (Poise) GELTIME (mins)* TENSILE STRENGTH (MPa)* TENSILE MODULUS (GPa)* ELONGATION AT BREAK (%)* APPROVALS PRODUCT Gelcoats LS 30PA Excel Superior weathering Iso/NPG spray gelcoat Thix. 9 LS 31PA Excel Superior weathering Iso/NPG brush gelcoat Thix. 9 LS 97PA An exceptional isophthalic spray gelcoat with excellent u.v. resistance, gloss Thix. 7 retention and water resistance LS 88PA An exceptional isophthalic brush gelcoat with excellent u.v. resistance, gloss Thix. 8 retention and water resistance Skin coats VE 690PA Pre-accelerated DCPD modified vinyl ester resin to create an enhanced surface finish Thix. 15 489PA Isophthalic skin coat with excellent durability and blister resistance Thix. 12 VE 679PA Pre-accelerated DCPD modified vinyl ester resin to create an enhanced surface finish Thix. 34 Resins 2.420PA Orthophthalic resin with low styrene emission, low exotherm and long geltime Thix. 63 2.406PA Orthophthalic resin with low styrene emission, low exotherm and rapid wet out Thix. 11 2.446PA Orthophthalic resin with low styrene emission, rapid wet out and fast hardening Thix. 25 ideal for rapid mould turnaround LS 451PA High performance low styrene DCPD modified resin to create an enhanced surface finish Thix. 20 701PA Closed mould isophthalic resin with low viscosity and controlled exotherm characteristics 1.6 59 703PA Closed mould DCPD resin with low viscosity and controlled exotherm characteristics 1.6 64 VE 679-03PA Pre-accelerated, non-thixotropic VE/DCPD resin for vacuum infusion 1.85 60 52 3.4 2.8 Lloyds 52 3.4 2.8 Lloyds 51 3.8 2.8 Lloyds 60 3.85 2.8 Lloyds 60 2.7 4.3 Lloyds 76 3.5 4.0 Lloyds 60 2.7 4.3 Lloyds 44 3.7 1.3 Lloyds 54 3.7 1.7 Lloyds 50 3.8 1.5 Lloyds 46 2.7 2.5 Lloyds 66 3.6 2.5 Lloyds 38 3.1 1.3 Lloyds 64 3.3 2.3 Lloyds *A variety of cure systems were used. Results are from a variety of different catalyst systems and cure programs and should be used for indicative comparison only. See individual product datasheets for more information. SCOTTBADER.COM 9 The quality of your mouldings can only be as good as the quality of your mould, making it essential that you use an appropriate and quality tooling system, like Scott Bader's Crestamould® Matched Tooling System. Using chemically matched products that work together, the high-performance Crestamould® Matched Tooling System delivers an excellent standard of mould production with great benefits to your project: · Significantly increases the lifetime of moulds in production · Enhanced gloss finish and gloss retention compared to competitive products · Easy to apply to required thickness · Trouble-free de-moulding, even complicated shapes · Reduced water marking · Reduced fibre print through for a much smoother gelcoat surface · Fast mould production Mould Manufacture Plug Manufacture Crestamould® Resin Crestamould® Skin Coat Crestamould® Gelcoat Release system Crestamould® Primecoat and Crestamould® Glosscoat Crestafix® Fairing Compound CNC Router Crestamould® Tooling Paste Crestamould® Sealer Plug Manufacture CRYSTIC® MOULDGUARD Crystic® Mouldguard is a tough temporary coating specially designed for protecting moulds and mouldings. Often, decommissioned moulds are stored outside where they are subjected to standing water, UV light, dirt and frost so they become damaged or scratched. Most moulders would agree that they rarely achieve the same quality of surface that they had before being decommissioned. Crystic® Mouldguard offers a simple solution. 10 MARINE PRODUCT GUIDE MOULD MANUFACTURE Crestamould® Gelcoat Crestamould® Gelcoat 15PA is a superior performance vinylester tooling gelcoat for making moulds designed to have a long service lifetime and retain high gloss levels after multiple pulls. Easy to apply with good coverage, there is no gassing ensuring a very low porosity surface. It cures with a standard MEKP catalyst. and is available in both spray and brush. Crestamould® Skin Coat Crestamould® Skin Coats VE679PA and VE690PA are pre-accelerated thixotropic DCPD modified vinylester resins that have been developed as a skin coat in tooling applications. They have excellent blister resistance and reduced print through. Crestamould® Resin Crestamould® Rapid Tooling Resin (RTR) 4010PA is a rapid tooling resin with outstanding handling properties, lower viscosity, improved shrinkage control and a standard MEKP catalyst. Available in natural and white It enables fast mould making and eliminates surface distortion. PLUG MANUFACTURE Crystic® Primecoat Crystic® Primecoat is a high build, polyester coating material which allows the rapid surfacing of patterns constructed from materials such as wood, MDF and GRP. It can be applied wet-on-wet up to a thickness of 1.5mm in one operation without sagging or draining from vertical surfaces. Crystic® Glosscoat Crystic® Glosscoat is a polyester coating designed to be applied over prepared Crestamould® Primecoat to give a glossier and more durable surface. The material hardens rapidly and can be easily sanded to a smooth surface which can be polished to high gloss. Crestafix® Fairing Compound A water resistant, low-density polyester-based fairing compound, Crestafix® F26 and Crestafix® F24 VE has excellent adhesion to cured fibrereinforced polyester and vinylester laminates. The material sands easily, gives a hard finish after a full cure, yet is not brittle and has good impact strength. Crestafix® F26 and F24 VE are suitable for all marine finishes such as polyester, urethane and epoxy paints. Crestamould® Tooling Paste Designed for milling of large plugs or direct limited production moulds with CNC multiple axis machines, Crestamould® T29 is a modified polyester compound, available in sprayable or extrudable versions. Crestamould® Sealer Previously not possible, Crestamould® B21 sealing resin enables laminating with polyester resin on top of polystyrene foams. Just one coat applied by brush will seal the surface ready for laminating with polyester resins two hours after application. SCOTTBADER.COM 11 CRYSTIC® GC LS 30PA EXCEL Crystic® GC LS 30PA Excel is a superior weathering Iso-NPG gelcoat specifically designed for marine applications. It is pre-accelerated and formulated for spray application. Crystic® GC LS 30PA Excel has been developed to have excellent intrinsic water and weather resistance. The viscosity profile ensures even coverage with minimal drainage and low film porosity. · Enhanced air release system for porosity control during spray application · Stability performance suitable for warmer climates · Specially formulated ISO-NPG UV-resistant base resin chemistry · Ease of application · Compatible with MEKP curing peroxides no gassing · Consistent batch-to-batch quality and colour consistency · High gloss · Excellent repair characteristics · Long term weathering resistance · Excellent porosity control · Excellent blistering and osmosis resistance 12 MARINE PRODUCT GUIDE Colour stability testing and measuring The prime objective was to develop gelcoats with exceptional gloss retention and colour retention, reducing the yellowing of white and cream-coloured gelcoats. Measuring the colour change was a critical factor for the project. Gloss retention 100% 80% 60% 12-month Florida weathering highlighting the superior gloss retention of LS 31PA Excel compared to competitive products. Comparative colour change testing Crystic® LS 30PA/31PA EXCEL was tested against a range of existing "best in class" white gelcoats. Accelerated QUV testing was carried out in advance of the longer-term Florida 12 Month UV exposure test results. Four sets of gelcoat plaques were tested at the same time with 12 months continuous exposure in Florida in comparison with the best-in-class marine approved Iso-NPG. Results Crystic® LS 30PA/31PA EXCEL gelcoat clearly provided better colour stability. Similarly, Crystic® LS 3PA0/31PA EXCEL achieved the same critical performance requirement meaning Scott Bader has a high degree of confidence using Crystic® LS 30PA/31PA EXCEL for white hulls below the water line. 40% 20% 0% LS 31PA Excel White Competitor Competitor Competitor Competitor Iso-NPG Iso-NPG Iso-NPG Isophtalic Gelcoat 1 Gelcoat 2 Gelcoat 3 Gelcoat Colour change (dE) 5 12-month Florida weathering demonstrating the significantly reduced yellowing of LS 31PA Excel compared to competitive products. 4 3 2 1 0 LS 31PA Excel White Competitor Competitor Competitor Competitor Iso-NPG Iso-NPG Iso-NPG Isophtalic Gelcoat 1 Gelcoat 2 Gelcoat 3 Gelcoat SCOTTBADER.COM 13 14 MARINE PRODUCT GUIDE MOULDINGS MADE TO LAST An unrivalled and ever-growing range of open and closed mould marine approved matched resins. Skin coat resins Scott Bader offers an outstanding range of high-performance skin coat resins for the composite marine industry, with excellent blister resistance which significantly reduces the occurrence of print through, to produce durable mouldings with an enhanced surface finish. Resins We were the pioneers of glass fibre composites over 70 years ago and still leaders in a wide range of resins for the composites marine sector. OPEN MOULD UP Resin · Crystic® 2-series PA - LSE resin · Crystic® LS 451PA - DCPD resin · Crystic® 489PA isophthalic · Crystic® 491PA Isophthalic Vinyl Ester + Vinyl Ester DCPD modified resins · Crystic® VE 671PAT · Crystic® VE 690PA · Crystic® VE 679PA · Crystic® VE 677PA CLOSED MOULD UP Resin · Crystic® 701PA · Crystic® 702PA · Crystic® 703PA · Crystic® 785PA Vinyl Ester · Crystic® VE 67903PA · Crystic® VE 677-03PA SCOTTBADER.COM 15 Crestomer® structural adhesives are used by the world's leading boatbuilders to improve performance, save time, and achieve considerable weight savings. Deck to hull bonding Core bonding Bulkhead bonding Engine bed stiffeners / stringer bonding Gelcoat Primed PVC or balsa core Laminate 16 MARINE PRODUCT GUIDE DESCRIPTION APPROVALS APPEARANCE WORKING TIME (mins) FIXTURE TIME (hrs)*** TENSILE STRENGTH (MPa) TENSILE MODULUS (MPa) TENSILE ELONGATION (%) SPECIFIC GRAVITY (g/cc) Crestomer® product range overview PRODUCT 1150PA 1151PA 1152PA 1153PA 1154PA 1186PA 1196PA Advantage 101 Advantage 301 Advantage 60 High performance structural adhesive with shorter fixture Lloyds, ClassNK Mauve gel 50* time 5 22 - 25 1000 - 1500 100 - 120 1.05 Adhesive for bulk Green/ application Lloyds, ClassNK yellow 25** 2.5 22 - 25 1000 - 1500 100 - 120 1.05 Amine accelerated gel High performance structural adhesive Lloyds, RINA, DNV-GL, ClassNK Mauve Gel 50* 10 22 - 25 1000 - 1500 100 - 120 1.05 High performance structural adhesive with long open time Lloyds, RINA, ClassNK High performance structural adhesive with a lower modulus Lloyds Mauve gel 90* Mauve gel 90 8.5 22 - 25 1000 - 1500 100 - 120 1.05 8.5 22-25 400-800 100-120 1.05 Multi-purpose structural adhesive Lloyds Grey paste 50* 5.5 13 16 700 900 4 - 7 1.30 Low density structural core bonding adhesive Lloyds, DNV-GL Pink paste 50* 6.5 19 22 1000 - 1500 4 - 7 0.60 High performance structural adhesive for Lloyds White paste 10 bonding a wide range of substrates. Minimal surface Lloyds, DNV-GL White paste 30 preparation required. Pre-packed in cartridges Lloyds White paste 60 1.2 22 - 25 400 - 600 100 - 120 1.15 2.5 22 - 25 400 - 600 100 - 120 1.15 3.0 22 - 25 400 - 600 100 - 120 1.15 Crestomer® dispensing equipment · Crestomer® Advantage 10, 30 and 60 cartridges can be used with a manual or pneumatic gun. Suitable dispense guns and static mixers are available from Scott Bader · Crestomer® adhesives can be dispensed directly from pails and drums using a manual or automated dispensing machine/ putty gun · Scott Bader technical support can provide advice on appropriate dispensing equipment *2% medium reactivity MEKP at 25oC **2% Perkadox® BT-50 at 25oC ***Time taken at 23oC to achieve 1.4MPA strength in lap-shire tests according to BS ISO 4587. 1Minimum order quantity 3000 cartridges each. SCOTTBADER.COM 17 Bonding pastes are designed specifically for applications requiring a high performance adhesive. The Crestafix® range has been carefully formulated to ensure ease of application, while retaining exceptional handling properties. OUR RANGE OF BONDING PASTES General purpose Materials suitable for non-structural GRP applications. The extensive range includes both orthophthalic and isophthalic bonding pastes with a variety of features, ensuring customers can find the right material for their application. Fast cure Materials suitable for non-structural GRP applications that cure very rapidly for either repair or fast assembly applications. Low density Also referred to as a core bonder, a low density paste is used to bond polyester laminates and to also to bond polyester laminates to balsa, PVC and PU core materials in sandwich structures. High performance These materials are formulated with the addition of unique Scott Bader urethane acrylate polymers, providing improved fatigue resistance and bonding strengths, particularly when compared to general purpose bonding pastes. These materials can be used for some structural applications. Fairing compounds Bonding pastes which are smooth, fast setting and easily sandable. They are used for smoothing out rough fibreglass surfaces. Fibre filled Bonding pastes containing short glass fibres to maximise bonding strength and provide excellent gap filling and bridging properties. 18 MARINE PRODUCT GUIDE NAME DESCRIPTION WORKING TIMES (mins)* COLOUR CHANGE TENSILE ELONGATION (%) LAP SHEAR STRENGTH (MPa)** SPECIFIC GRAVITY (g/cc) Crestafix® adhesive product range overview CATEGORY GENERAL PURPOSE B39W 9082PA Pumpable polyester-based bonding paste with gap filling properties General purpose orthophthalic bonding paste 621CC 45 HIGH 621CC PERFORMANCE 85 Urethane acrylate/ isophthalic polyester bonding paste Urethane acrylate/ isophthalic polyester bonding paste 630PA Vinyl ester bonding paste FAST CURE 9078PA Fast cure orthophthalic bonding paste LIGHT WEIGHT 9084PA Lightweight orthophthalic bonding paste with low exotherm FIBRE FILLED 9080PA Polyester bonding paste with short fibres CORE-BOND B72R Lightweight, polyester-based core adhesive for foams and balsa FAIRING COMPOUND F26R Fast setting polyester-based fairing compound with good sanding properties F24VE Lightweight, 100% vinyl ester resin fairing compound for use below the waterline 55 None (grey) 1 12 Blue to white 2 25 Blue to grey 3 50 Blue to grey 3 60 Deep purple to brown 3 8 None (white) 1 30 Blue to cream 6 12 Blue to grey 2 55 Blue to white 2 3 None 1 (light pink) 10 None (grey) 1 4 1.05 5 1.35 10 1.25 10 1.25 7 1.10 5 1.30 4 0.60 4 1.25 5 0.70 2 0.70 2 0.70 Bonding pastes dispensing equipment · Pails and drums can be dispensed using an automated 50:1 dispensing machine · Scott Bader technical support can provide advice on appropriate dispensing equipment and catalyst usage *1-2% medium reactivity MEKP @25°C Refer to TDS for specific catalyst levels. **Values are based on substrate failure. SCOTTBADER.COM 19 GRP STAINLESS STEEL ALUMINIUM POWDER COATED STEEL COLD ROLLED STEEL GALVANISED ABS ACRYLIC POLYCARBONATE PVC PP/PE & TPO Toughened, two component primerless structural adhesives designed for bonding composites, thermoplastics and metals, making them ideal for the marine industry. Key information: CRESTABOND® FEATURES CUSTOMER BENEFITS Primerless adhesives Dramatically enhances production efficiency and reduces consumable costs Minimal surface preparation Reduces dust emissions and preparation time Excellent fatigue and impact resistance Confidence in the longevity of the finished product Range of working and fixture times Optimises production cycles to reduce manufacturing costs Good gap filling capability Adhesive can be used in multiple applications Bonds dissimilar substrates Provides flexibility in structural designs Crestabond® dispensing equipment · The Crestabond® cartridges can be used with a manual or pneumatic gun. Suitable dispense guns and static mixers are available from Scott Bader · Crestabond® adhesives can be dispensed directly from pails and drums using an automated 1:1 or 10:1 dispensing machine · Scott Bader technical support can provide advice on appropriate dispensing equipment COMPOSITES METALS PLASTICS PRODUCT M1 range M1 HV M7 range PP-04 20 MARINE PRODUCT GUIDE DESCRIPTION COLOUR MIX RATIO BY VOLUME VISCOSITY (cP) WORKING TIME (mins) FIXTURE TIME (mins)* TENSILE STRENGTH (MPa) TENSILE MODULUS (MPa) ELONGATION AT BREAK (%) GAP FILL (mm) Crestabond® adhesive selection guide Choose the appropriate Crestabond® adhesive product with optimal working and fixture times that will ensure long-term adhesion and durability. PRODUCT M1-02 Universal bonder Dark grey 10:1 100,000 140,000 1 - 2 2 - 3 12 - 16 600 -1000 80 - 100 1 - 15 M1-04 Universal bonder Dark grey 10:1 100,000 140,000 3 - 5 8 - 10 16 - 20 600 -1000 80 - 100 1 - 15 M1-05 Universal bonder Dark grey 10:1 100,000 140,000 4 - 7 12 - 18 16 - 20 600 -1000 80 - 100 1 - 15 M1-10 Universal bonder Dark grey 10:1 100,000 140,000 8 - 12 16 - 23 16 - 20 600 -1000 80 - 100 1 - 15 M1-20 Universal bonder Dark grey 10:1 100,000 140,000 16 - 22 25 - 35 16 - 20 600 -1000 80 - 100 1 -25 M1-30 Universal bonder Dark grey 10:1 200,000 240,000 25 - 35 60 - 80 18 - 22 600 -1000 100 - 130 1 - 50 M1-60HV Universal bonder Green 10:1 340,000 380,000 50 - 70 150 180 22 - 26 1200 1600 50 - 70 1 - 50 M1-90HV Universal bonder Green 10:1 340,000 380,000 80 - 100 210 240 22 - 26 1200 1600 50 - 70 1 - 50 M7-04 M7-05 M7-15 Universal bonder Off white 1:1 Universal bonder Off white 1:1 Universal bonder Off white 1:1 30,000 70,000 3 - 5 12 - 15 22 - 25 30,000 70,000 4 - 7 18 - 22 22 - 25 30,000 70,000 10 - 20 30 - 45 22 - 25 1200 1700 1200 1700 1200 1700 6 - 10 1 - 5 25 - 30 1 - 5 25 - 30 1 - 5 PP-04 Low surface energy bonder Off white 1:1 70,000 140,000 3 - 5 165 180 12 -17 800 - 1200 2 - 5 0.5 -5 Based on laboratory results *Time taken at 23°C to achieve 1.4MPA strength in lap shear tests according to BS ISO 4587. SCOTTBADER.COM 21 TROUBLESHOOTING When handled correctly, gelcoats provide a durable and reliable finish. Here are some common reasons behind why some faults may occur: Common faults in gelcoat Common faults in gelcoat Colour tearing · Pigment separated from resin · Improper spray technique · Long geltime, sagging Colour separation · Insufficient mixing · Sagging, drainage · Poor gelcoat application Colour mottling · Poor pigment compatibility · Viscosity too low · Gelcoat low in thixotropy Parallel cracks · Flex cracking · Gelcoat too thick · Laminate too thin / flexible Blisters on laminates · Water ingress · Damp reinforcement · Air voids Star cracking · Reverse impact · Gelcoat too thick · Crack pattern transferred from mould Gelcoat blisters · Air voids on release · Unreacted catalyst · Solvent contamination Crazing · Chemical attack · Excessive heat · Contamination Fibre pattern · Gelcoat too thin · High exotherm in laminate · Insufficient cure / released too soon 22 MARINE PRODUCT GUIDE Colour specks · Poorly ground / mixed pigments · Contamination · Poorly maintained equipment De-wetting (spray) · Spray gelcoat applied too thinly · Incompatible release system · Contamination Water-marking / etching · Areas of thin, double gelcoating on mould · Two colours gelcoated on mould · Solvent attack De-wetting (brush) · Brush gelcoat applied too thinly · Incompatible release system · Contamination Wrinkling · Insufficient cure · Gelcoat too thin · Back-up too early Dimpling · Too heavy wet-on wet spray application · Insufficient consolidation · Contamination Sagging · Gelcoat too thick · Geltime too long · Viscosity / thixotropy too low Gelcoat peeling · Contamination · Gelcoat too fully cured · Geltime too long - release wax dissolved Porosity · Gelcoat too viscous to release air · Gelled too quickly, entrapping air · Cold gelcoat and / or mould · Spray gelcoat applied with too high or low catalyst / gelcoat pressure SCOTTBADER.COM 23 SCOTT BADER GROUP COMPANIES Head Office Scott Bader Company Limited Wollaston, England Tel: +44 (0) 1933 663100 Email: enquiries@scottbader.com Scott Bader France Amiens, France Tel: +33 3 22 66 27 66 Email: enquiries@scottbader.com Scott Bader Spain Barcelona, Spain Tel: +34 93 583 17 68 Email: enquiries@scottbader.com Scott Bader Germany Weiden, Germany Tel: +49 961 401 84474 Email: enquiries@scottbader.com Scott Bader Ireland Dublin, Ireland Tel: +353 1801 5656 Email: enquiries@scottbader.com Scott Bader Scandinavia Falkenberg, Sweden Tel: +46 346 10100 Email: enquiries@scottbader.com Scott Bader Eastern Europe s.r.o. Praha 6, Czech Republic Tel: +420 (0) 485 111 253 Email: enquiries@scottbader.com Scott Bader Croatia Zagreb, Croatia Tel: +385 1 240 6440 Email: enquiries@scottbader.com Scott Bader North America Mocksville, NC, USA Email: info@scottbader-na.com Scott Bader ATC Drummondville, Canada Tel: +1 (819) 477 1752 Email: enquiries@scottbader.com Scott Bader South Africa Hammarsdale, South Africa Tel: +27 31 736 8500 Email: enquiries@scottbader.com Scott Bader Middle East Dubai, United Arab Emirates Tel: +971 481 50 222 Email: enquiries@scottbader.com Scott Bader Asia Pacific Shanghai, China Tel: +86 (21) 5298 7778 Email: enquiries@scottbader.com Scott Bader Japan KK Yokohama, Japan Tel: +81 (0) 45 620 3745 Email: Otoiawase@scottbader.com Scott Bader Australia Perth, Australia Tel: +61 (08) 9418 4555 Email: enquiries@scottbader.com Scott Bader India Scott Bader Pvt. Ltd, Mumbai, India Tel: +91 8655427455 Email: enquiries@scottbader.com Scott Bader Brasil Civit II, Serra, ES 29165-973, Brazil Tel: +55 27 99243-5080 Email: enquiries@scottbader.com Scott Bader Italy Milan, Italy Tel: +39 3454534391 Email: enquiries@scottbader.com Scott Bader Turkey Istanbul, Turkey Tel: +90 542 207 01 86 Email: enquiries@scottbader.com Issue 4 - February 2025 SCOTTBADER.COM Registered office address: Scott Bader Company Limited, Wollaston Hall, Wollaston, Wellingborough, Northamptonshire, NN29 7RL. Registered in England No. 00189141. Y5085/v402/25