I tried spray-sealing some minis yesterday. It didn't seem that humid, but I guess it was . . .
Now I have 10 minis including that cleric that need to be gloss sealed when it's less humid, hopefully wiping out the frost, and then re-sealed. They stay in my "not done yet" pile until this humidity breaks and I can find some good gloss seal. Sigh. If that doesn't work, they stay this way - I'm not stripping and and repainting them.
Oddly, the four Bones minis I also spray-sealed didn't frost at all. Not even a tiny bit. Nothing else was different about the paints, pre-sealers, etc. yet only the metal ones frosted. Huh.
But yes, just . . . grr.