Hey,
I also use melamine and find that they are notorius for being damaged with excessive moisture build-up. What I like to do, is cover the pieces of melamine after the materials have been cut to size, with contact brand paper, used to cover cupboard's or Kitchen counter tops. The material is water resistant and works great under high humidity environments. The contact paper is made of plastic (vinyl) and stretches quite nicely, so that you can always pull it back a little as you are applying it, and then fix any problems encountered in the application of it. I learned this technique from a friend, Greg Maxwell, and it has worked well for me thus far. Also, I find that I don't have the need to spray my cages as the cages I built hold quite enough humidity in and of them selves. Click on the link below for tips on applying.
Link: http://www.finegtps.com/cagepaper.htm
- Angel
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Sometimes on your way to your dream, you get lost and find a better way!