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I don't think it's possible to seal them at all, any sealant would blister or crack.
If we find a sealant that could instead react and neutralize the corrosive gases or at least give us a fair...

I'm not sure if it applies to Acrylic but some plastics will crackle up badly from solvents like Acetone.
It's best to have a test piece and do everything on it before you do it to the scales.

That won't happen, only the surface will react with the atmosphere and get colored.
Unless you heat it way to long (minutes-hours), then you can get strange things to happen, like "Hydrogen...