We bought a home built in the 1920's The sellers were very deceitful about several things, one being that the basement has a major leak in wet weather. We had water pouring in on rainy days and would spend hours with the shop vac cleaning our basement on rainy days. We hired a pro who sealed a couple cracks & painted with a waterproof paint. Still a small leak. I sealed a little more with a rubber paint, still a small leak, though much improved. After some research we purchased the SX5000 and sprayed the outside foundation 2x as directed. So far it's looking good. It really didn't change our foundation color, and our last 2 downpours, our basement remained dry. We'll see how it holds up in the fall and next spring.