I live in the South. Fall and winter can have issues.[had them when living in Ohio too]
High humidity 80%ish and when afternoon sun gets cool/cold quick 50ish. Which is early afternoon 3-4 O'clock.
Blush like these conditions.
Object get moisture from air condensing on them in garage or work area. [unless climate controlled.]
You don't see it, but its there.
In any case, to remove/PREVENT blush:
You can keep work light/s near object epoxied to prevent blush with heat, or remove blush usually with plain warm water or add a just a drop or 2 soap, to cup of water.
I just use Windex mostly for ease, and wipe with acetone when ready to re-epoxy or paint.
If you are experiencing blush in climate controlled rooms I have no idea. Never did myself.
PS I did build small glass boats in my youth and repair big ones.
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By the way it usually happens when the dew point is within 7-9 degrees of ambient temp. Same for when you spay paint used same condition, your reds, oranges,blacks will "haze" look 'cloudy" or "blush" the worst.
The aerosol paint mist picks up moisture from saturated air.
Also settles on wet epoxy causing blush.
Just check weather like on Windy for dew points. Can be a toasty 75-85 out but if 85-90% humidity your in trouble. Or 50-60 with 50% humididty..trouble .
So there is the science. I had to check daily for years when doing commercial work.
If conditions are right can happen just about anywhere in US.
Disclaimer: my numbers may not be perfectly accurate, just what my parameters are, based on past reading/ research and experience in field.