May 8, 2016 - 54 sec Easily repair spider (hairline) cracks on your. Oct 21, 2015. Cases of hard impacts, pins or situations where the canoe is wrapped, gelcoat can chip and crack. The good news is that gelcoat can be repaired quite easily and if properly maintained your composite canoe will give you decades of use. Here's our video showing how to complete a typical gelcoat repair. Dec 21, 2016. 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. Download Peta Jogja Swf Player there. Sometimes, they're merely cosmetic, meaning they don't penetrate the gelcoat. Patch 1 2 Ita Neverwinter Night 2 Werewolf here. Sometimes, they go deeper and. 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. This thicker gel-coat cannot stand ANY flexing without showing cracks.