Mu Supra had a manufacturing defect in the platform, just a little gel void that popped and was an eye sore.
Covered under warranty but sometimes It's just not worth the hassle and I'd rather just fix it myself.
Gel coat is really easy to repair especially if you can get a matching gel.
Spectrum makes paste repair kits (in the picture) for most makes and models just put in your year. Older more faded boats it probably won't match perfect but it's still a lot better than a gouge!
Tape it up (I use 2 layers so you don't have to worry so much about sanding through it on the rough paper)
Mix the gel according to the instructions and slather it on there going in every direction to get it in all the voids. Doesn't have to be pretty you're sanding it all off anyway.
Sand it back, I start with 150 grit, you can go lower but it takes longer to get the scratches out. 150 is aggressive enough IMO.
Once its roughed out you can remove the tape and go to 400 grit.
From there it's up to 1000 grit
Then 2000 then a quick rub with some buffing compound and you're good as new:
Same deal works for dock rash, scratches, gouges, hole patching etc.