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PostPosted: Tue Aug 27, 2013 5:45 am 
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Joined: Sun Jul 27, 2008 7:58 pm
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Location: Shelter Island, NY
I picked up some Preval 267 Sprayers and finishing Gelcoat. Am I going to need to thin the Gelcoat or will the Preval sprayers handle it without thinning?
What is the most affordable thinner to use, if that is necessary?

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PostPosted: Tue Aug 27, 2013 8:35 am 
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Location: Oceanside, California
You need to thin it. I used to use acetone. Thin to a milky consistency. Spray light / thin coats and wait a bit between each (10 seconds?)... been a long time though!

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PostPosted: Thu Sep 12, 2013 4:56 pm 
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Thin with styrene.


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PostPosted: Fri Sep 13, 2013 7:11 pm 
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Location: New Port Richey Fl.
Second the styrene. Especially white gel. Thin until sprays evenly, use a test surface. Apply thin coats as Matt says, wait a couple of minutes between coats. Last coat should have "sanding aid" added to allow for proper anerobic curing and ease of sanding out of "orange peel" hardened surface.

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PostPosted: Fri Sep 13, 2013 7:33 pm 
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Location: Raleigh, North Carolina
+2 on Styrene - Put down a couple more coats than you think you need. Prevail sprayers with thinned gelcoat take several (many?) coats to build up a decent layer of gel on the boat. It's much easier to do a little extra sanding than have to respray after you've sanded through a too-thin layer of Gelcoat.

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