You seem to really know gel coat and I would like your advice. I paint cars on the side but have little to zero gel coat experience besides colorsanding it.

I have some gouges on the bottom of my hull. Some one sealed them before me with clear 4200 or 5200. It seems to have at least kept the water out of the fiberglass but the guy i bought it from said it never would last long and he would have to continually smear more on the gouges.

I have bought (but hasn't delivered yet) a 14 oz. marine tex mighty repair kit which I assume is a 2 part epoxy putty. I should have asked before i bought it, but is this the correct stuff to properly and permanently seal the gouges? The gouges are on the very bottom of my hull and pad, will this stuff be watertight below the waterline? The boat doesn't leak now, but i do know i need to seal the gouges up as they are all the way thru the gel coat.

My hull is black with no flake, the kit is gray. Can I spray some black paint over the marine tex? I guess it doesn't matter being where it is but I would like to know if I even have the option to hide the repairs a little better.

Also, should the gouges be ground out some and feathered up to the gel, or should the surrounding gel coat be scuffed up. I would assume yes as this will not be a chemical adhesion like base coat/clear coat. If yes what grit do you recommend using in the gouges and what grit on the gel?

Thanks for taking the time to answer my questions...