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Old 04-27-2013
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sandblasting with crushed glass

I am a snadblaster and i use crushed glass. I have customer that wants his 42" sailboat blasted down to the gel coat and the gel coat just roughed up to apply a new coat. I would use 60-100 grit on it. Is it a good idea? If so, what precautions should i take?
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Old 04-27-2013
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Re: sandblasting with crushed glass

I don't have any expertise with blasting hulls but just from the general knowledge you get from owning a boat I think soda blasting is the most common method of blasting paint from a boat hull. Never heard of crushed glass being used. It might be too hard for the gel coat. If the gel coat gets compromised it could lead to osmotic blisters.
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Re: sandblasting with crushed glass

thanx for the reply, but when talking to the owner, he didnt want to sod blast because he had heard that it may lead to blistering. Thats why he called me to see if it could be blasted with glass beads.
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Old 04-28-2013
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Re: sandblasting with crushed glass

He might be remembering the opposit of what he heard. There was a good article on soda blasting in Pratical Sailor a few months back. If I'm remembering correctly the reason for using bicarbonate of soda is that as a blasting medium is that it is softer than other blasting mediums and more controllable. You would know better than me but it seems to make sense If the owner is concerned about blistering he should consider a barrier coat before putting on the new bottom paint.
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Re: sandblasting with crushed glass

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Originally Posted by batmdcatw View Post
thanx for the reply, but when talking to the owner, he didnt want to sod blast because he had heard that it may lead to blistering. Thats why he called me to see if it could be blasted with glass beads.
Wait, are you blasting with glass beads or crushed glass? Two different media with two different abrasive profiles.
I'd soda blast, and the yard the boat is in would probably be happier with soda blasting as well. You're removing a soft paint, not trying to strip oxide from steel, so no advantage to a harsher abrasive.
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Old 04-28-2013
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Re: sandblasting with crushed glass

My freind works for a large blasting company and they use nothing but soda on hulls, it called an eco blaster mixed with water and soda it contains all material from the bottom that has been removed. good for the ole envirnment ya know
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Old 04-28-2013
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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.

FWIW...
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Old 04-28-2013
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Re: sandblasting with crushed glass

I refused to use a contractor to blast my hull because he wanted to use crushed glass (aka silica, aka sand) Sand is much too abrasive, and has too much mass. I found another contractor that used baking soda as a blast media, and was/am VERY happy with the results.
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Re: sandblasting with crushed glass

crushed glass and silica are not the same thing. You can make sand into glass, but you can't make glass into sand. CG is more gentle and more consistent than silica, but still more abrasive than soda.
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Old 04-29-2013
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Re: sandblasting with crushed glass

Soda blasting or sanding. Nothing else.
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