I know there have been some threads on hull repair but most of those deal with either minor scratching or holes all the way through. My problem is a few gashes that have penetrated the gelcoat/plastic and then part way into the fiberglass. Would I be better of filling this with something like MarineTex and then sanding it or getting a fiberglass repair kit? If I do go with the kit could I just cut the mat/cloth pieces a little bigger then the gashes, press them into it in layers, and then sand down the excess a little? I assume you don't want to sand it all the way flush with the rest of the hull or it might expose some of the original damage.