Mapei Mapei Primer G

WHERE TO USE

• For treating gypsum surfaces prior to fixing 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. Some application examples
• Preparing cement-based surfaces prior to smoothing with self-levelling or thixotropic smoothing compounds.
• Between layers of smoothing compounds once the first coat is perfectly dry.
• On gypsum plasters prior to smoothing with cementitious products.
• On anhydrite surfaces prior to applying cement based products.
• On cementitious renders prior to smoothing with gypsum based products.
• On gypsum walls as a fixative for wallpaper adhesives.
• Before installing ceramic tiles with cementitious adhesives on:

– gypsum plasters and sprayed gypsum;

– prefabricated gypsum panels;

– fibrous-gypsum panels;

– anhydrite screeds.

• Treating gypsum walls, chipboard, cement fibre boards, foamed concrete, renders etc. prior to papering or painting.

TECHNICAL CHARACTERISTICS

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 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 illuminates of the tile adhesives which, in the presence of moisture, leads to the formation of the salt “ettringite’’ which is the cause of tiles breaking away from gypsum substrates. 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 finishing time and helps prevent shrinkage cracks. When used before the application of selflevelling compounds, Primer G reduces the formation of air bubbles and helps prevent over-rapid drying making selflevelling 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, laitance, 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 mechanically abraded. 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 without diluting it. If the gypsum plaster surface is especially smooth and glossy, it is recommended to abrade it beforehand. Once it has dried fix the tiles.

b) As an anchoring coat for gypsum plasters. Dilute Primer G 1:2 with water and stir well; spread the mix on the surface with a flat brush or spray pump. Apply the sprayable gypsum 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. Cleaning Tools and containers should be washed at once with clean water. Any remaining residues once dry have to be removed mechanically or with Pulicol 2000.

CONSUMPTION

The consumption of Primer G depends on the porosity and absorption of the surface. Normal consumption is between 0.08 and 0.15 kg/m². PACKAGING Primer G is available in 25, 10 and 5 kg plastic drums and in 1 kg bottles.

STORAGE

Primer G, in its original unopened packaging, can be stored 24 months. Protect from frost.

SAFETY INSTRUCTIONS FOR PREPARATION AND APPLICATION

Primer G is not hazardous according to the regulations on the classification of mixtures. It is recommended to wear protective gloves and goggles and to take the usual precautions for handling chemical products. For further and complete information about the safe use of our product please refer to the latest version of our Material Safety Data Sheet.

PRODUCT FOR PROFESSIONAL USE.

WARNING

Although the technical details and recommendations contained in this product data sheet correspond to the best of our knowledge and experience, all the above information must, in every case, be taken as merely indicative and subject to confirmation after long-term practical application; for this reason, anyone who intends to use the product must ensure beforehand that it is suitable for the envisaged application. In every case, the user alone is fully responsible for any consequences deriving from the use of the product.