Hi Simon, That looks like a classic case of moisture entrapment. It can happen
when underlying coats of primers or sealers are wet sanded and then topcoated
without a proper drying time in between. It can also happen when topcoating
is done in too humid of conditions. When I was a tech rep for Polyfiber I flew
to Henstridge, UK to repaint (topgloss!) a Jabiru kitplane with Flightgloss.
Every morning the hanger would be dripping wet! Not ideal painting conditions,
but with heaters we got it done. With the exception of a spray booth in
Miami with four inches of water on the floor at all times it was the worst
conditions
I have ever painted in. Put it out in the sun and see if they dry out.
We can go from there.
Jim T.
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