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OK,
I asked my PCB Assembly friend whats the best way to conformal coat a board. He said that you should use an acrylic or urethane based coating. You can actually just use something in a spray can from Home Depot. You will want to bake it for a few hours, the longer the better. Set it for between 120 and 150F and you will be all set. This will take most of the moisture out of the fiberglass and wont get trapped in. If you can leave it in longer, leave it longer.
After it comes out, coat it nicely. The urethane will be the easiest to modify if there are circuit mods needed.
-Adam
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