For a clear coat on the interior you have a few choices. One is to try and track down the original builder of the cage and find out what was originally used and then use more of it. The one exception would be if an oil-based polyurethane was the original sealer. Way to much hassle and offgassing, IMO.



Another choice is to use the Zinsser Seal Coat like I recommended and then use a water-based polyurethane over that. The caveat here is that you would really need to use a plastic flooring of some sort as I don't consider WB poly to be durable enough for the floor of a Boa cage. But this is a good idea regardless.



Your last choice is the most expensive but probably also the most durable. You could use Envirotex Lite or one of the other solvent-free bar top epoxies and pour on a thick but very durable finish. I like these epoxies but they are expensive and fussy. Some people who have tried them have reported problems with incomplete curing. It's never happened to me but I do feel like I should warn people of this possibility.
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Current snakes:



0.0.1 Gonyosoma oxycephala - Java locale (green)



2.2 Gonyosoma janseni - Seleyar locale (all black)

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