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Old 22-12-2014, 07:59   #16
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Re: Repair of hairline cracks in gelcoat

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Originally Posted by Emmalina View Post
Used to use a product called Capt Tolleys creeping crack cure. Not sure if it is still on the market
It is available at amazon.com

Quote:
Creeping Crack CureŽ remarkable penetrating waterproof sealant, covers the smallest hairline cracks
Leaves a clear, almost invisible seal
Use for window casings & sills, plumbing joints & more
No mixing - simply squeeze and go! 2fl. oz. each
Works on wood, brick, tile, ceramics, plastics, fiberglass, concrete and more
Quote:
Usage Indoor applications
It seems to be more for buildings than boats.
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Old 22-12-2014, 09:18   #17
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Re: Repair of hairline cracks in gelcoat

It's not for gelcoat repairs.
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Old 22-12-2014, 10:25   #18
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Re: Repair of hairline cracks in gelcoat

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Originally Posted by Emmalina View Post
Are you sure fiberglass absorbs water ! You might find polyester or GRP does but fiberglass !!!
The reason boats are made out of GRP (Polyester) is cost not practicality Fiberglass is 3 times the price. Having made many fuel tanks and holding tanks out of fiberglass can't say the substrate has absorbed anything !
I'm struggling to understand this....... Fibreglass is fibreglass (i.e. literally fibres of glass). GRP stands for 'glass reinforced plastic' which can be polyester, epoxy, or any of a number of less-common resins that are absorbed into a mat of glass fibres and then harden to form a plastic material which is reinforced by those glass fibres.
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Old 22-12-2014, 10:31   #19
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Re: Repair of hairline cracks in gelcoat

Epoxy is a vapor barrier. Polyester is not.
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Old 30-05-2015, 17:57   #20
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Re: Repair of hairline cracks in gelcoat

I was advice to cover cracks with decal vinyl
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