New Or Painted Masonry
Surface must be clean and free of dirt, grease, oil, soap and other contaminants. New masonry must cure at least 30 days before applying
Previously Painted Surfaces
WATERTITE® is designed to produce a waterproof finish when applied to bare masonry.
It can be used over previously painted surfaces, however its waterproofing ability is then dependent upon the integrity of the previous coating.
For best results, remove as much of the old coating as possible by manually scraping the surface, followed by thorough wire brushing.
A belt power sander with a 50 grit sanding belt is also effective