UV screening products.
Poly boats by the best manufacturers have enough UV inhibitor in them that frequent use of 303 is a waste of money.
Royalex boats are skinned with a top layer of vinyl, inside and out. Vinyl is the most UV resistant of commonly used plastics. Frequent use of 303 on a "young" Royalex boat is not necessary. When Royalex gets old and looks kinda chalky, 303 can make it look nicer.
I have several composite (glass/Kevlar) boats that have no gelcoat, only a colored topskin. That resin is somewhat UV vulnerable. The maker of two of these composite boats recommends using a premium yacht wax rather than 303. Such waxes contain good UV inhibitors. Wax also protects a bit more against scratching the colored topcoat than does 303.
The 303 people are very tight-lipped about how long the stuff stays on and stays working. My opinion is maybe 3 standard driving and paddling outings.
2-3 Canoe/Kayak Trailer
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