You're talking about the "Snow Roof" type stuff typically meant to seal travel trailers? I've have used it. It holds up VERY well. The first several coop I built I used it on the floors and walls, but to be honest, the floors never really get wet if you're doing DLM correctly, and a good quality porch paint is more than adequate for walls. I stopped painting coop interiors some time ago, I just don't see the advantage honestly. My current coop is T-111 and I didn't paint the inside. It's holding up just as well as my other coop with the painted interior.