We purchased a modular home and put it on a block foundation. We could see the block wick the water up every time it rained which raised some concern. We decided to seal it until we could get gutters put up. I wanted to stain the block so it looked better. The seller advised we do this then use this sealer so that is what you see. It was super easy, I used a pump sprayer and a big 4" brush to back brush it and make sure it got all up in the block. It took me about 4 hours to do 600 sf of block. It has rained since this was done and no wicking lines so I am happy. Unfortunately this is the type of product that has to have time to prove its quality, but so far, I am very happy.