Ok, this is what I did today, I took the hide in the pic, put wax paper on it and sprayed it with the Great Stuff. It's much bigger outside but it would be about the same inside. I have painted the Great Stuff hide 2x with white, then I plan to paint color on it.
Better top view
Inside - the wax paper peeled off easily.
Will this be safe for the snakes? I will let it sit out for a week or so before I'd put it in. Should I paint the inside with white at least? Then I have a sealer that I used on my clay hides. This was very easy, it's kind of big, but I now now that I can make larger hides with these and just use current hides for the right size.
any ideas or suggestions? Now my problem is the tube that came with the great stuff is all clogged...gotta figure out how to get it unclogged so I can use it.