I spent waaaaay to many hours re-gelcoating the bottoms of my old Hobie 16 and finally just got tired of doing it. The boat was getting old so I decided to just use Marine Tex and was never happier. The advantage is that (a) the stuph cures slowly giving you plenty of time to work, (b) is thick so it spreads easily to where you want it and to the desired thickness (don't get me wrong, its gluey and takes some patience to work with, but worth the effort), (c) sands/fairs very well and (d) is harder than GelCoat (at least it seems like it to me.) The only disadvantage I found is that MarineTex is not quite as white as gelcoat and seems to be a bit more porous and will suck up stain in some kinds of water. However, with the small strips of wear and (you show), the marine tex--if it stains, can't be seen when the boat is right side up. You Do spend most of your time right side up, right?

Just something to consider.