You can buy a kit from NRS or Jamestown Distributors that contains 4 oz of G Flex epoxy resin and 4 oz of hardener, along with some colloidal silica powder, stirring/application spatulas, dental syringes and what not for about $25. If you can beg, borrow or steal a little fiberglass cloth to go with it (or at worst buy a yard of it) you will have enough to do the repair.
Mix up small batches of epoxy with silica powder mixed in and use it to fill any void where the outer solid stratum of ABS is gone and the foam core is exposed. By using multiple thin applications of thickened epoxy and sanding in between you can fill and fair the damaged hull back to its original contour and essentially replace the outer solid stratum of ABS with epoxy.
It would be best to cover the area of repair with at least one layer of fiberglass, though. This can be cut in a tear drop shape similar to the commercial Kevlar felt abrasion plate material. You apply it using the G Flex. Multiple applications are required to completely fill the weave of the cloth. If you feather the edges of the abrasion plate it will be quite smooth and one layer of 6 oz/yd fiberglass cloth will stand barely proud of the adjacent hull and cause much less drag than the thick Kevlar felt plates.
Add a $5 can of Krylon Fusion or Valspar plastic spray paint to cover the plates.
Reflective Hull Decals
Wall Mount Boat Racks
Pull-Up Strap Handle Kit
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