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Old 17-06-2014, 23:30   #1
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Bare Fiberglass Exposed to Sun

I'm doing some fiberglass work on my deck right now and in four to five months I'm going to have the gelcoat ground down and re-done. I've heard and had limited experience with bare fiberglass delaminating if its left uncovered and exposed to the sun but I don't want to paint the work I've done only to have to strip it off in a few months when I got to apply the gel coat. Any suggestions? I'm in Guatemala so the sun is rather intense.
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Old 18-06-2014, 00:39   #2
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Re: Bare Fiberglass Exposed to Sun

The damage is done by UV. Ideally putting it into a shed, but if that isn't possible then tarps. Preferably heavy duty ones.
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Old 18-06-2014, 07:22   #3
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Re: Bare Fiberglass Exposed to Sun

Gel coat the repaired area now.
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Old 18-06-2014, 07:54   #4
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UV breaks down polyester resin quickly. if you have to, after the repair paint with gel coat and when you're ready for the final finish you will have more sanding to do but your glass will be good
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Old 18-06-2014, 10:26   #5
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Re: Bare Fiberglass Exposed to Sun

That makes sense. I've never gel-coated before so I wasn't thinking about it as an option. My next thought was to lay an extra layer of mat down, paint it and then grind it all off when the time came to gel-coat. That would be much more work. Thanks for the help guys.
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Old 18-06-2014, 10:29   #6
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Re: Bare Fiberglass Exposed to Sun

Quote:
Originally Posted by sparrowhawk1 View Post
UV breaks down polyester resin quickly. if you have to, after the repair paint with gel coat and when you're ready for the final finish you will have more sanding to do but your glass will be good
I thought Gel Coat was basically just polyester resin with dye in it. Does the dye also contain UV inhibitors?
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Old 18-06-2014, 10:43   #7
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Yep. Gelcoat protects the polyester from UV. Basically the pigments don't let the sunlight through. Edit. The very outer layer may break down because like you said its mixed with polyester resin. that's why older boats get" chalky"
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