The first step to using Drylock paint to waterproof masonry walls is to use a wire brush to clean the wall and remove debris or loose mortar. If any efflorescence is present, remove it with a muriatic acid wash. Any holes or cracks in the walls should be plugged, as well as any seams present where the wall and floor meet. Once dry, stir the Drylock paint, and apply at least two coats to the masonry wall.Continue Reading
When applying Drylock paint, use a 3/4-inch nap roller or nylon bristle brush for full coverage. If using a roller, make sure to roll over each area twice on the first coat to avoid the appearance of pinholes. If pinholes present after the second coat of paint is dry, apply another coat of paint to those areas. All pinholes must be plugged with paint to ensure waterproofing.
If cracks or holes need plugged, Drylock recommends using its Fast Plug cement. Mix according to the packaging's instructions, but only mix as much cement that is to be used within the next three to five minutes, as it dries rapidly. Apply it with a chisel in the shape of an upside-down V. This application locks the cement into the masonry wall and allows it to cure.Learn more about Home Maintenance