epoxy or vinylester acquire a haze or "chalk". I have two epoxy boats and three vinylester boats, none of them varnished or gelcoated, and they have not shown any visible effects of water, moisture, or UV exposure. I do store them in a shaded carport, but otherwise they are exposed to the elements.
So I can't explain your experience. Maybe if CE Wilson comes by, he will know.
Full Size Sail Rig
The Kayak Wing
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