Rapid Set 50 lbs. Waterproofing Mortar ... - The Seven Trust
One section of my concrete wall was flooded recently so I wanted to water proof it. I smoothed and scraped the surface with a concrete grinding wheel using an angle grinder. The instructions said you could use a brush or 3/8" nap roller or you could trowel it on. I chose to use a margin trowel and a rectangular finishing towel.