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Old 03-09-2016, 05:02 AM   #1
sparrot1

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Default Tacky polyester resin

I applied a coat of polyester resin to a plug. It was waxed and should have fully cured. Two days later it is still tacky, too soft to sand.The resin left in the pot gelled properly, I don't know whether it fully hardened as I threw it away. I used resin from a container that had been open for approx 4 months but stored at a consistent 65 degrees. Application temp 72 degrees although the application shed is very tight so vapors persisted in the air for at least 36 hours. So, what do I do? The plug is 62 sq ft so it would be hard getting it all off.
Does wax settle out in stored resin, could I apply wax to surface.
Can I re-coat hoping the new top coat cures both.
Even though it's tacky, would the presence of wax inhibit bonding.
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Old 03-09-2016, 07:45 AM   #2
Roger

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Okay, I'm guessing you coated the plug with polyester resin to create a surface you could sand out and polish. If that's correct you are doing (or at least attempting) a whole lot of work that isn't necessary. Resin is hard to sand. There are coatings specifically made for this part of the process. Duratec is one name brand.

If I was you, I'd 1) get some surfacing primer (like Duratec makes) and 2) coat the plug with that and then sand. Since you used what was supposed to be a waxed resin, conventional wisdom says don't overcoat. However, the surface is sticky so you should bond without problems.
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Old 03-09-2016, 10:02 AM   #3
sparrot1

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I applied this coat on top of wood strips and fairing compound with the intention sanding and then adding two layers of glass to ensure the plug retains its shape. I think I will go ahead with the glass. If it's too tacky to sand I ought to get decent adhesion.
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