You can mix milled fiberglass in with your Epoxy for a very strong bond/fill. My favorite is the Duraglass, or the 3M Marine High-Strengh Blister Repair. Both of these used short strand fiberglass mixed in with a special high strength body filler. If you ever scrape again the damage will be superficial. To protect your paint use a strip of adhesive backed velcro (fuzzy side) on your tips. They will take an impressive amount of abuse and when they wear down, replace them with a new strip.