I would go with PVC over wood since retics like to play the "I'm gonna dump my water bowl every day" game, but there's no way it will be as cheap as a 6x2 melamine enclosure.
I've never used this and I don't know how much surface area one gallon will cover, but have seen it recommended to seal wood in a reptile enclosure:
http://agralifeproducts.com/products...nel-Seal-1-Gal
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