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Old 01-28-2019, 03:31 PM   #21
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,516
Crazing is usually cosmetic. Easy to drill out with a dremel, pain to fair due to small spaces and curves. Then the paint must be color matched. Sort of like the 10th coat of varnish. I know I should but it always ends up on the bottom of the list.

If it's a real wide crack, say a 16th or more, then I would put it at the top of the list.
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Old 01-28-2019, 03:51 PM   #22
City: Here
Join Date: Sep 2012
Posts: 2,937
Re: Cosmetic cracks only that do not penetrate the laminate - Gelcoat cracks for a reason. Repairing them usually lasts for a year or two unless that reason is also addressed. Vast majority are due to flexing, some caused by improper application from the factory. Permanent fixes on these types are virtually impossible.
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Old 02-27-2019, 10:06 PM   #23
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City: cincinnati
Vessel Name: deja vu
Vessel Model: 1987 senator 35 sundeck
Join Date: Jan 2019
Posts: 77
Originally Posted by djmarchand View Post
Gel coat is considerably harder and more brittle than the underlying fiberglass resin base, so it cracks sometimes because the underlying fiberglass flexes but the gel is too brittle. I believe that in most cases gel coat cracks are cosmetic and don't affect the underlying fiberglass or core. I would fill the bad ones, but as you imply they often come back.

i totally agree. i have a sea ray cruiser with a lot of cracks in the gel coat on the non skid portion of the bow. my fibreglass guy said they will not cause any water intrusion, its just cosmetic
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