For new or previously painted masonry surfaces as brickwork, concrete, cement and rendering. Berger Alkali Sealer is also used to bind loose chalky surfaces in order to provide a sound surface for application of topcoats. Berger Alkali sealer is recommended as a seal for areas where soil moisture moves upwards into walls and form salt deposits which damages the paint film known as efflorescence.

Surface preparation:

• Concrete and cement surfaces must be completely dry
• The sealer will NOT prevent blistering of top coats if moisture is present in the surface
• Once surface is dry, remove any peeling paint with a scraper and any white powder with a dry cloth

Application Procedure:

• Ensure that the concrete has been cured for at least 30 days
• Remove all efflorescence, other surface contaminants and loose material
• Wire brush (hand or power tool), dry abrasive blast or wash with high-pressure water jet
• Check moisture content of concrete with standard moisture meter
• Proceed if moisture content is <10%
• If >10% find and resolve moisture source before applying Alkali Sealer

Tips: Always remove efflorescence from surface before painting. Failure to do so will result in a poor, friable base, preventing sound adhesion of topcoats.