Hello guys i am designing a multi level ball python setup up. It will be three layer each enclosure being roughly the size of 40 gallon breeder made out of ply wood with opening door fronts and slate bottoms. I found a product in the diy section before that i was going to use to rubberize the inside but it got lost out of my favorites. The product was used for porches, water towers, and all kinds of other things any suggestion on products or website to check out would be great. The way that i am going to do it is have the bottoms open except a small rim and rubberize the hole insides and silicone in a peice of slate for the bottom. So has to be a product that silicone will adhere to fix the slate and be able to stand the temperature of the heat pad being attached to the slate with out seperating. Im not going to get into the design of the tanks to much just looking to find the rubberized product i found before of something else that will work for me thanks.