Fiberglass cracks most of us know that fiberglass has a very limited ability to bend - instead it cracks when overstressed. these fiberglass cracks can be purely cosmetic, or can severely degrade the boat's ability to stay afloat.. The right hull has some cracks where the rudder attaches to the hull that will need to be fixed. i have no fiberglass experience, but would like to learn. the owner of the boat has experience but no time right now to do the job, so i would like to try to do this repair myself.. Filling in the gaps. there are many ways to repair cracks in fiberglass—which one’s the best? stress cracks, spider cracks, and hairline cracks in the decks of older boats are, of course, not rare..
Spider cracks are non-structural damage to the gel-coat of a boat. this damage is often caused by slight flexing of the hull. these hairline fractures also occur in boats of the mid 1970's vintage which often had thicker gel-coat layers than newer boats.. Spider cracks are a form of fiberglass damage that occurs from minor flexing or impacts. they can occur in any form of fiberglass, including cars, boats and swimming pools. small cracks form in the outer surface of the fiberglass, spreading out from a central point like a spiderweb.. This will make it possible to fill the crack with epoxy resin. wipe the crack with a dry rag to make sure it's clean and dry. if it's not clean and dry the epoxy won't adhere well. fill the crack with a fair amount of fiberglass epoxy resin, using a plastic applicator. make sure the crack is completely filled. let the epoxy dry for a day..
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