Old as Dirt!
Join Date: Nov 2008
Location: Tampa Bay Area
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Re: sandblasting with crushed glass
Bead blasting was fairly common practice at one time. It is, however, very difficult to avoid undue damage to gel coat unless the blast master is exceptionally skillful and cautious as glass beads have a much greater hardness than soda. One might fear that residual soda media remaining imbedded in the gel-coat could lead to blistering of the paint as moisture migrates through the paint layers but a proper wash with a pressure cleaner and an subsequent mild acidic wash down prior to the application of a barrier coat should eliminate any residual soda that might otherwise be a concern.
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."