As recommended by my block supplier, I used this to seal the split face block around my basement walls above the grade to seal out moisture. My home is next to a 5 mile span across the river facing northeast. We get wind-driven rain here blowing up to 60 mph for several days at a time. I was getting moisture driven through the 12 inch block wall leaking into my basement garage. I applied this as directed with my garden sprayer and got no moisture through the wall during our last 4-day nor'easter! The 5 gallons put two generous wetting coats around the house, 4 blocks high and a 200' perimeter. I got some overspray on the dark blue siding and it disappeared when dry. My only suggestion is be sure to shake the product well before use. It does separate a bit during storage and it remixes easily.