This is amazing stuff. I had plumbing experts telling me I needed to spend about $4,000 on a “French drain,” which would also entail digging up my yard, all to prevent seepage into my sunroom. I saw the Flex Seal ads on TV, and I figured I’d give it a shot. Half a can later, sprayed along the base outside, and, miracle of miracles, no more seepage. I calculate I could buy 284 more cans for the price of one French drain.