Melamine is "resistant" to water, not impervious to it. Every melamine cage that I've seen with high humidity or water contact warps and then cracks.
NEVER believe some1 that says their melamine cage/enclosure is water proof....might be on the corners where the 2 pieces are put together....ie silicon on the creases, but the actual board is not impervious to water left standing on it........wipe it off right away and yea, it will not damage it........thats what its ment to do.....like on counters.....u wipe a spill off of it.
Thats why there is plastic cages on the market......these are water proof.