This is my first time working with GreatStuff expanding foam to make a background. It was interesting to work with.

This is for a 40 gallon aquarium and is going to be used for a juvi Dumeril monitor. I was going to chip away at the hardened foam a bit, then paint it with acrylics. The enclosure is going to be at a constant 50-75% humidity, what should I use to coat the paint? Thanks.
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Cheers,

Michael Starkey