sand blasting to gell coat????
Be careful with the pressure washer. I really liked the immediate response that I got with the tightest tip on the washer when I was removing barnacles from the steel keel. Trouble is that when you put it on the non-steel hull, it removes gel-coat too and down to fiberglass. Now I have several holes of gel coat to patch before I can paint. Summary- Don''t use the most powerful tip.