Sad to say but mine is going the same way after about 18 months. Stored outside but seems to have come on suddenly with the recent warm weather. It's probably down to keeping it in gel coat for so long before having it painted. I can't see me getting anything done about it this year so when the time comes may try to provoke it with a bit of gentle localised heat. It will be interesting to see if anything happens to the doors. If not, then my "damp" grp theory is probably the most likely reason.
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