The bottom of my fiberglass hull appears to have many layers of anti-fouling
paint. I was thinking about sanding it down some then repainting in the
spring. I understand that I need to be careful that I don't sand into the
gelcoat(?). I was thinking of using an orbital sander with 80 grit
sandpaper. Any reason to not take this approach? Do I need to clean it right
after or will leaving it still spring be ok. The hull has already been power
washed.

Thanks,
SteveL