Bugs_and_Herps

So I’m making one of those diy rock structures with foam and grout for a leopard gecko I am adopting. I just finished painting on a nontoxic sealant but I only had enough for two layers. Is that enough? I don’t want to have to go out and buy more if I don’t have to in the terrible weather I’ve been having. I ask because I don’t remember how many layers I did for my last rock structure… advice appreciated. Thanks