[Destroyer]

Originally Posted by garagenc

Hey D
That's why I said for him to ask his blast guy if he has any exp with it. They can blast at a lower psi and it wont hurt the gel coat. I've had 2 experiences with blasting that way and they both came out ok on private boats. The shells can be be fine or coarse depending on what the surface is behind what you are trying to remove. When the shells are fine they work like soda. I became aware of it about 20 years ago when we used it at a Navy Yard on steel hulls, then we started working with a company that refined it so we could do fiberglass hulls for the "Admirals Barge" and all the fiberglass hull launches.

Garage, that's great to know.. THANK YOU!!!!!! (I've actually used walnut shells when I redid my rowboats trailer... I didn't have a concrete or mecadam area available to me at the time, so I used my lawn.. I figured that any grains that the lawn vac didn't pick up would eventually decompose. They worked great, but it took more media to do the same job that sand would have done)