It is difficult to get a complete seal this way from what I have been told. Just browse any fish forum and read about the trouble people have with just the corners of fish tanks much less five entire panels.



With the gravel I think you want to seal the boxes with something with a lot of durability. I'm thinking a thick layer of epoxy or polyester resin. Or maybe an actual layer of plastic and then caulk or solvent welding agent used along the edges where the panels join.



There are a lot of rubberized paint type sealers but I don't know much about them.



Back to the truck bed liner example, you could also mask off the bottom 12" or so of the cage and have it professionally sprayed if you're really worried about it. Otherwise, I have heard of the Wal-Mart product being used in cages and tanks.



A professional cage builder who visits this forum uses the two-part garage floor paints and then puts in piles of substrate for his monitors. That should also hold up fine but I believe it comes in two-gallon minimums. He uses the solvent-based variety.



If it were me I think I'd use solid plastic to make a built in tray on the bottom.
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Currently keeping a small collection of various Gonyosoma. Both G. janseni and G. oxycephala.

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