KERAKOLL - logo2053 Primer A Eco 5Kg
Instruction ManualKERAKOLL 2053 Primer A Eco 5Kg

LAYING RANGE/Preparation of the substrates

Primer A Eco

Certified, eco-friendly, water-based surface isolation for dry, absorbent mineral/cement/gypsum or anhydrite-based substrates, ideal for use in GreenBuilding. Single-component, solvent-free and with very low volatile organic compound emissions. Safeguards the health of both operators and the environment.
Primer A Eco develops an isolating, cohesive film that neutralizes the expansive chemical reaction of gypsum- or anhydrite-based substrates in contact with mineral mortars and adhesives. Reduces and regulates the absorption of highly porous substrates.KERAKOLL 2053 Primer A Eco 5Kg - fig 1


  • Solvent-free
  • Efficient dust-proof action
  • Extends the workability of mineral adhesives and levelling products
  • Suitable for underfloor heating systems


Use Creation of a suitable barrier to neutralize the expansive chemical reaction of gypsum and anhydrite-based substrates before laying ceramic tiles with mineral or cement-based adhesives and/or correction of absorption of highly porous substrates.
– gel adhesives, mineral adhesives, dispersed organic mineral adhesives
– cement-based and dispersed adhesives
– mineral finishing, levelling and self-levelling products
– cement or gypsum-based finishing and levelling products and plasters
– gypsum and cement-based plasters
– mineral screen
– anhydrite and cement-based screeds
– gypsum brick and plasterboard panels
– high-density chipboard, cellular concrete
– prefabricated concrete and fresh concrete castings
On internal floors and walls, even in areas which are damp, on external walls.
Do not use
On external flooring as a waterproofing product for metallic, unstable wood and wet substrates or those subject to moisture rising.


Preparation of substrates
Substrates must be compact, smooth and absorbent, free from dust, oil and grease, free from moisture rising, with no loose and inconsistent debris. Varnishes and paints must be removed completely. The substrate must be stable, non-deformable and with no cracks. Plasters with a gypsum base must present a residual humidity 1% and screeds with an anhydrite base of 0.5%, both of which should be measured with a carbide hygrometer.
Preparation Primer
An Eco is ready-to-use and can be applied to walls and floors as a surface isolation product to neutralize the expansive chemical reaction of gypsum or anhydrite-based plasters and screeds in contact with cement-based products. Shake the can well before opening in order to redisperse the liquid evenly. For compact, low-absorption substrates of any kind, apply two coats of Primer A Eco diluted 1: 1


with water to guarantee the best possible penetration. Dilute Primer A Eco with clean water up to a 1:3 ratio to reduce and regulate the absorption of water or suppress dust in highly porous substrates to improve the penetration of the priming coat in the substrate. Prepare in a bucket the quantity of water required for dilution, then add Primer A Eco according to the indicated ratio. Mix briefly before use.
Apply a fine, uniform film, preferably using a short bristle, synthetic fibre roller or brush. Apply a second coat crisscrossing the direction of the first. The distinct green colouring of Primer A Eco allows the user to check whether the application is complete and uniform. Apply several coats to more porous substrates, waiting until the previous coat has dried completely before proceeding with the next. Do not pour the product straight onto the floor; do not allow the stagnant Primer A Eco to build a surface film on the floor.
Cleaning Primer
An Eco can be removed from tools and other surfaces by washing them with water before the product hardens.


After applying Primer A Eco and before laying the surface covering, check if the moisture content of the substrate is suitable for the type of coverage selected. Applying Primer A Eco to absorbent substrates improves the workability of finishing and levelling products and is a necessity when applying self-levelling products, especially when these are of reduced thickness.


Certified preparation of gypsum or anhydrite-based substrates before laying mineral or cement-based adhesives, mineral or cement-based finishing, levelling or self-levelling products, with eco-friendly, single-component, water-based surface isolation with GreenBuilding Rating® Eco 5, such as Primer A Eco by Kerakoll Spa. Apply with a roller or brush for an average coverage of 0.15 ­ 0.25 kg/m2. The substrate must be perfectly clean, dry and free from moisture rising.


Appearance Green liquid
Specific weight ≈ 0,99 kg/dm3
Shelf life ≈ 12 months in the original packaging
Warning Protect from frost, avoid direct exposure to sunlight and sources of heat
Pack 25 – 5 kg cans
Dilution ratios: Brookfield method
– isolation product for gypsum and anhydrite ready to use / 1 part Primer A Eco: 1 part water
– regulation of absorption 1 part Primer A Eco: 2 – 3 parts water
Viscosity ≈ 17.9 mPa · s, rotor 1 RPM 100
pH ≈ 7,5
Temperature range for application from +5 °C to +35 °C
Minimum waiting time before laying:
– isolation product for gypsum and anhydrite ≥ 4 hrs
– regulation of substrate absorption ≥ 1 hr
Maximum waiting time before laying ≤ 24 hrs
Coverage ≈ 0,15 – 0,25 kg/m2

Values are taken at +23 °C, 50% R.H. and no ventilation. Data may vary depending on specific conditions at the building site: temperature, ventilation and absorbency level of the substrate.
Conformity……………….EC 1 plus GEV-Emicode………………………..GEV certified 1230/11.01.02

– Product for professional use
– abide by any standards and national regulations
– do not apply on roughened substrates or substrates which require heavy thicknesses of product
– make sure the substrate is perfectly clean, dry and compact
– If the product has been washed away or removed mechanically, it will have to be replaced by a further application
– check substrate adhesion before overlaying – do not use it as a waterproofing product
– use a calcium carbide hygrometer to measure and ensure that the humidity of the gypsum is 1% and of the anhydrite 0.5% at the moment of laying.
Follow the manufacturer’s instructions
– if necessary, ask for the safety data sheet
– for any other issues, contact the Kerakoll Worldwide
Global Service +39 0536 811 516

The Eco and Bio classifications refer to the GreenBuilding Rating® Manual 2012. This information was last updated in July 2018 (ref. GBR Data Report – 07.18); please note that additions and/or amendments may be made over time by KERAKOLL SpA; for the latest version, see KERAKOLL SpA shall therefore be liable for the validity, accuracy and updating of the information provided only when taken directly from its institutional website. The technical data sheet given here is based on our technical and practical knowledge. As it is not possible for us to directly check the conditions in your building yards and the execution of the work, this information represents general indications that do not bind Kerakoll in any way. Therefore, it is advisable to perform a preliminary test to verify the suitability of the product for your purposes.

BS 18001 CERTIFIED IT255412/UK
Via dell’Artigianato, 9 – 41049
Sassuolo (MO) Italy
Tel +39 0536 816 511
– Fax +39 0536 816 581

Documents / Resources

KERAKOLL 2053 Primer A Eco 5Kg [pdf] Instruction Manual
2053, Primer A Eco 5Kg


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