Mapei Primer G

Primer G is a synthetic resin-based primer which, once applied to any surface, dries to form a flexible, compact, shiny
coating which consolidates the surface, where needed. Primer G also improves the adhesion of smoothing compounds,
paint, adhesive for wall paper, adhesive for tiles and mortar for renders. The film of Primer G on the surface of gypsum or
cement, prevents any chemical reaction between sulphates and the cement aluminates of gypsum which, in the
presence of moisture, leads to the formation of the salt “ettringite’’ which is the cause of the separation of the two
elements. The use of Primer G when papering allows to reduce the substrate’s absorption and, as a result, the amount of
glue used, thus making the wallpaper removal much easier. When used before applying sprayable plasters, Primer G
prevents over-rapid absorption of water by the substrate, prolongs workability time and helps prevent shrinkage cracks.
When used before the application of self-levelling compounds, Primer G reduces the formation of air bubbles and helps
prevent over-rapid drying making self-levelling easier. Primer G is not flammable and can
therefore also be used in closed, unventilated environments without any precautions having to be taken.
RECOMMENDATIONS
PRIMER G
Synthetic resin-based water-dispersion primer with
very low volatile organic compound (VOC)
• Primer G does not waterproof gypsum substrates even though it considerably reduces their porosity and absorption.
• Do not apply onto magnesium substrates.
• Primer G is not recommended for external applications or where rising damp is present.
• Do not apply Primer G in such a quantity that it forms a surface film; dilute with water as appropriate for the absorption
of the substrate.