As I keep harping on, take in the bigger picture and get your crew/helpers to do the same, I was in the local boatyard yesterday and ended being asked a question about rope cutters, whilst standing next to the guy who had just finished antifouling his superb Rustler I noticed some small nicks in the gelcoat of the sloping transom. Worth doing? Of course it is, you don't want moisture in the laminate, if a deeper cavity than that in the attachment use Plastic Padding Marine Filler (above waterline use only) follow with Plastic Padding Gelcoat filler in white. Incidentally it's not rocket science, even I can do it! Other materials/tools you will need inc Acetone, clean cotton rags, selection of wet and dry in various grades and a sanding block. Remember of course, if you are filling in chips/gouges underwater the filler you use must be epoxy like Plastic Padding's epoxy filler, International's Watertite or my favourite and good value Epifanes epoxy-filler 1300.