Cinder blocks can be found in basement walls and home foundations, and are strong enough to stand up to years of wear and tear and weathering. However, cinder blocks exposed to any kind of moisture can seep or drip, often causing staining or allowing water to seep into your home. Applying paint to cinder blocks will not waterproof them. Instead, paint cinder blocks with DRYLOK, manufactured by United Gilsonite Laboratories in Scranton, Pennsylvania, to seal the blocks and create a waterproof barrier that can protect your home.
Things You'll Need
- Mineral spirits or paint stripper
- Cement patch
- Paint stirrer
- Nylon paintbrush
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Clean the cinder blocks with mineral spirits or a similar solvent to remove dirt, dust, grease, oil or wax from the surface. If the cinder blocks were previously painted, strip away all old paint with paint thinner or paint stripper.
Rinse the entire cinder block surface with clean water to remove residual cleaner. Inspect the surface. Patch any cracks or holes in the cinder block with fast-setting cement patches, applied per product instructions. Allow the wall to dry completely before continuing.
Stir the DRYLOK thoroughly with a paint stirrer. Do not add paint thinner or additives.
Paint DRYLOK onto the surface with a nylon bristle paintbrush. Apply an even coat, being sure to work the DRYLOK into the pores of the blocks. Allow the first coat to dry for three hours before continuing.
Apply a second coat of DRYLOK to the surface. Allow the second coat to set for three hours, and then inspect the surface. Patch any holes or gaps in the paint with a third coat as necessary. Allow the DRYLOK to set overnight before touching the cinder blocks.