Application

WHERE TO USE

• For treating gypsum surfaces prior to installing ceramic tiles.
• As an anchoring coat for gypsum-based sprayable plasters.
• To improve the adhesion of smoothing compounds on cementitious or anhydrite and gypsum-based surfaces.
• To provide uniform absorption in cementitious or gypsum surfaces.

Primer G is a synthetic resin-based primer which, once applied to any surface, dry to form a flexible, compact, shiny coating which consolidates the surface, where needed. Primer G also improves the of gypsum 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 alluminates 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.

Primer G makes wallpaper stripping far easier and decreases the amount of glue used for paperhanging. 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 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.

APPLICATION PROCEDURE
Preparing the substrate
The substrate must be clean, dry and free from oils, grease, residual paint and other loose material.
In each case, the manufacturer’s recommendations for gypsum-plaster must be followed, particularly as far as moisture content and level of surface finishing are concerned.Cracks in concrete surfaces must be repaired with Eporip or Epojet.
Anhydrite surfaces must be sandpapered.

APPLICATION
a) As a treatment for ceramic tiles installed on gypsum. Stir the Primer G just before use, spread it uniformly on the surface with a flat brush or roller without diluting it. If the gypsum plaster surface is particularly smooth and glossy, it is recommended to abrade it beforehand. Once it has dried, install the tiles.

b) As an anchoring coat for gypsum plasters. Dilute Primer G 1:2 with water and stir well; spread uniformly the mix on the surface with a flat brush or roller or spray pump. Apply the sprayable gypsum plaster as soon as Primer G is dry.

c) As a primer before applying self levelling compounds and thixotropic smoothing compounds from the MAPEI range on:
cementitious substrates: dilute Primer G 1:1 with water;
gypsum based substrate: use Primer G neat.

d)As a primer for wallpaper adhesives
Dilute Primer G 1:3 with water.

e) As a primer between smoothing layers
Dilute Primer G 1:1 with water.