It is an epoxy gel coat on fiberglass & carbon cloth.
Gel coat is miserable and expensive but, happily, there are dozens of compatible kits, like Yobuck said, for boat repair.
You can even do a color match.
https://www.amazon.com/Evercoat-Gelc...oat+repair+kit
But if you have to build the surface up any hard two-part epoxy will give you the bottom/filler. You want a two-part putty (easier to form to existing curves) and a product like PC-7 comes in small amounts (to ounces is like $5). Hardware store item. Cut a piece of plastic to make a spatula and keep some 91% alcohol on hand to clean up any "overages". It has a nice working time as well.
https://www.amazon.com/PC-Products-1...ds=epoxy+putty
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