Epoxy is fine as one component of fiberglass reinforced thermoplastic as a structural material.
Epoxy is fine as an adhesive.
Epoxy is fine as a cosmetic fairing and filling material.
Unreinforced epoxy is not a structural material, except in very limited ways.
If you are thickening it with short, medium, or long strand glass fiber, it can form a reinforced thermoplastic for structural applications. But, the longer the strands, the more structural -- and the harder to work with.
Where the scrapes are just into filler, I'd happily clean them up, clean up around them, and make a nice epoxy repair.
Where the scrapes expose significant damaged or removed glass fiber, I'd want to clean up the whole area around it, shape it for a tapered repair, and build it back up with fiberglass, before using epoxy to fill any cosmetic defects, to hide the texture of the glass, and to fair. Layer the larger pieces of glass under the smaller ones as you build it up. This is because it gives you the most bond to the old material, and then everything builds back with a good foundation. Don't do more than ~4 layers at a time or it can get really hot, melt the old work, not cure properly, or worse. You don't want to cook it.
It is fine as a cosmetic filler.