Thanks for the insigt. Very good info here. I had gotten a response on another board (at TrailerSailor.com - nice site BTW) that reccommended "Plastic beads" instaead of sand. Maybe that is what your guy used, but I will defintily as the Yard managers at my marina for some reccommended professionals. I just hope the cost does not blow my budget, but I think the scraping and rough sanding would be a brutal amount of work!