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The damage is not that serious but I would like to repair it anyhow....Will ptex stick?? Ptex is not just glue sticks for hot glue guns right??

Sand it smooth and put some resin in the scratches. I personally would not worry about those as it does not go to the fiberglass or the core.

You can try using a clear P-TEX candle. Not sure what Wainman use has base plastic could be PET or maybe UHMWPE (P-Tex, Durasurf) base looks opaque could be UHMWPE. Idea is to clean up area with blade and some Isopropyl alcohol. You light the candle and drip the melted plastic into area building it up. Then just take a plastic scraper and level it out again done.

Video below gives you a basic idea.

And did you fix it? People are kind enough to take time to reply you should maybe do the same.