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The pictures of the abraded area look odd to me. If this is a Royalex canoe, it would have had a vinyl outside layer from the factory. It takes quite a bit of wear, usually over years, to wear away the vinyl and expose the ABS layers underneath. I don't recall ever seeing blue ABS layers, but then I've never seen an Easy Rider canoe.
I suspect this canoe may have been painted yellow over the original vinyl layer. All paint, or repaints, will wear away fairly quickly when scraped along rocks or otherwise abraded. I'm not familiar with putting epoxy over a repaint on a canoe. Maybe it would slightly deter paint abrasion, but I'm not sure.
You could repaint the entire canoe or just touch up the one damaged area or just put some tape over it. It all depends on how much time and money and extra weight you want to put into a used canoe. Personally, I'd use it for a season to see if more abrasions happen to the yellow paint, if it is paint. Others may have different viewpoints or suggestions.