re: restoring old fiberglass boat

Wet sand.

The fiberglass is oxidized, you need to remove the oxidization layer and it will look brand new. It is very labor intensive and time consuming. Exactly how bad is determined by the level of oxidization.

id start with 800 grit and see if that did the trick, if not step up to 600. Then work your way back down to at least 1000, more if you realy want it shiny. Then rubbing compound, polish and wax.