Time takes its toll - sun, salt and sea water will oxidise gelcoat, stealing the shine and leaving a rough, dull surface. The question is, if GRP is so good, why does this happen? It's simply that Gelcoat suffers from both oxidation and UV attack. Now, oxidation and UV damage are not the same thing. They don't have the same effect on a boat's finish and it's important to know the differences between them. Oxidation, caused by exposure to oxygen, results in the chalking you see on the palm of your hand when you touch an unprotected boat. This process is slowed by good maintenance and this means regular waxing, protecting the gelcoat from the elements.
UV damage is increased if you don't maintain the shine of your gelcoat. Shiny surfaces reflect UV rays better than dull surfaces and UV rays not only cause discolourations but can mechanically degrade the Gelcoat.
While oxidation only affects the surface, UV damage penetrates the full thickness of the gelcoat and can even damage the fibreglass beneath it. So, keeping oxidation under control will also keep UV damage at bay.
However, despite your best efforts, you will, eventually, find yourself losing the shine. Surfaces may look dull and tired and also feel rough to the touch. It may be time to consider some plastic surgery.
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Blue turning white. This neglected gelcoat requires more than a quick wax! |