no doubt orbital try an find an use ''green color 3 M brand paper '' a belt sander is to much to fast an will gouge in a heartbeat & loves to do it.. a viberate sander doesn't have enuff umf..
If you have multi-layers of paint, try a power washer,held very close to the surface, then use a scraper for chipped and loose stuf.A sander unless used with a lot of caution, can ruin the bottom.We did it on a 26' last year ,worked fine.
