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Originally Posted by Cape Codder
Finally got in touch with one of these guys and he seems pretty knowledgeable. I'd be comfortable giving him the job but but he wants to do it with Vynilester and Penske board. Would you guys consider that a good plan? Sounds like coosa and epoxy is the way to go from what Ive been reading around here.
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Penske and Coosa are basically the same thing. Also called Airex Pxc which is made by Baltek.
He wants to use Penske (Airex) because Composites One has it in stock and delivers on the Cape on Thursdays.
They don't stock all that much Coosa. Composites One bought Baltek or something and they now have a lock on the Airex product.
I've worked with legit Coosa and also the Airex (penske) product and they are identical as far as I can tell.
I would also be OK with Vinylester.
Vinylester has a much better secondary bond (new work to old work) than Polyester, which is really only good for new work, or for making parts from scratch. Polyester doesn't stick to old work very well.
Epoxy has the best secondary bond of all, but the slow cure times can really complicate things for a production shop.
I work for a boatyard, and redid my own transom this winter with epoxy, but that was over christmas when we were closed for a month, and I wasn't in a hurry.
I did some of the interior glasswork, and the three knees to the stringers with vinylester, with no issues.
Vinylester is a kind of hybrid resin that cross-links like a polyester and is peroxide cured, but has epoxy molecules in it to keep it from shrinking, to toughen it up, and to make it more waterproof than Polyester.
I use vinylester all the time. Hardly ever use polyester, and use Epoxy only on special occasions.