Surfaces must be prepared thoroughly before commencing application. All substrates must be structurally sound, stable, dry, and clean, Smooth shiny surfaces to be roughened or etched. Rough surfaces are to be evened or filled first. Building surfaces must be constructed to manufacturer’s recommendations and relevant building standards in force at time of membrane application. All surfaces are to be free of sharp protruding surfaces, loose material, de-bonded coatings, curing membranes/agents, release agents, wax residues, foreign particles, laitance, algae and moss, grime, oils, animal fats or grease remains.
Structurally unsound layers and surface contaminants are to be mechanically removed by abrasive blasting, blast tracking, grinding or equivalent methods.
Primer: Only required to resolve problematic surfaces that might affect adhesion. These might be highly porous surfaces such as limestone, glossy surfaces such as glass or plastic, or damp/moist surfaces.
If necessary, please use one of the following Primers:
- Betta Prep Coat Primer – for general porous vertical and horizontal building surfaces. Brush or roller apply primer to total surface area at a minimum coverage of 1 litre per 6m2 and allow drying for 30 minutes or once wet film dries to a clear transparent coating
- Betta Super Primer – for non porous, smooth and dense surfaces. Brush or roller apply primer to total surface area at a minimum coverage of 1 litre per 10m2 and allow to dry for 1 hour
- Betta Damp Stop – for surfaces with residual or rising damp. Apply by brush or roller in 1-2 coats at a minimum coverage of 1litre per 8m2 per coat. Allow to dry for a minimum 24 hours before applying membrane. Primer must be tack free before applying membrane.