Mapei Mapeproof Primer

Mapei Mapeproof Primer is a one component, ready to use polyvinylidene chloride based dispersion primer which dries rapidly to provide a waterproof surface membrane.

Best Uses

Mapei Mapeproof Primer is a one component, ready to use system which dries rapidly to provide a waterproof surface membrane. Mapeproof Primer is formulated to impede the passage of residual construction moisture from affecting subsequent floorcovering installations, therefore allowing early installation of floor coverings.

• Ready for use
• No mixing is required
• Easy to apply by roller
• Colour pigmented to aid coverage uniformity
• Fast drying
• Low consumption/high coverage

Suitable for damp-proofing cement based, moisture-resistant, non-heated substrates where residual moisture content values are up to 4.5 CM-%, before the application of levelling compounds.

Also suitable for insulating residual construction moisture where relative humidity values are up to 95%.

Application

Substrates must be uniformly sound, free of dust, loose particles, cracks, paint, wax, oil, rust or other products that can interfere with bonding. Screeds and concrete bases over base ground must be provided with a structural damp proof membrane. The residual moisture content of non-heated cement screeds must not exceed 4.5 CM-%. Cracks have to be filled with a suitable product (such as Mapei Eporip, Mapei Eporip Turbo or Mapei Eporip SCR) before applying Mapeproof Primer.

Joints designed to allow movement of the substrate must not be bridged with Mapeproof Primer, but sealed with a suitable impervious flexible jointing compound after the application of the membrane. The absorbency of the screed must be ensured. Compact substrates must be prepared mechanically. Shake the can to mix the contents immediately prior to use. Mapeproof Primer must be applied in a minimum of two coats. The floor temperature must be above +10°C when the primer is applied. Mapeproof Primer should be applied over the whole floor. With particularly low absorbent or finished screeds with a tight surface, first apply a dilute coat of Mapeproof Primer (1:1 with water) and allow to dry (approx. 20 mins).

This will ensure that the Mapeproof Primer penetrates into the surface of the screed prior to applying the two coats of undiluted Mapeproof Primer.

1st Coat: Using a pre-coated roller, apply the first coat in one direction, ensuring that the material is worked well into the substrate.
2nd Coat: When the 1st coat is touch dry, approximately 15 - 30 minutes at +20°C, apply the 2nd coat at a right angle to the 1st coat. It is essential that a pin-hole free coating is achieved and to maintain a consumption of approx. 250 g/m² as a two coat application (coverage: 3 m²/kg).

When applied to very absorbent surfaces, the membrane can be absorbed into the substrate, leaving a subdued shine. In such instances or where pinholes and weak spots are evident, a further application will be required.

After complete drying of the primer, smoothing compounds from the MAPEI range can be applied. The drying times vary depending on the absorbency of the substrate and the room climatic conditions (temperature and humidity) between 2 and 5 hours. Apply the appropriate MAPEI smoothing compound within 12 hours of the curing of Mapeproof Primer to provide an absorbent surface suitable for the application of adhesives.

If Mapeproof Primer is not covered within 12 hours of curing, a further coat must be applied and allowed to dry before proceeding with the application of the skimcoat.