Help! air bubbles in epoxy

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Joined: Wed Aug 29, 2012 6:32 pm
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Help! air bubbles in epoxy

Post by dioxinman52 »

I'm frustrated. I'm almost done filling the weave on the fiberglass. The squeegee spread coat cured fine with no bubbles. The first two filling coats applied by roller set up fine. This last coat gets air bubbles in it no matter what I do. Same roller, same epoxy (Glen-L), same temperature, same humidity.

What's going on?
My day job: Associate Professor of Pharmacology. US Army Reserve Civil Affairs Officer

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Re: Help! air bubbles in epoxy

Post by vupilot »

If the temperature is rising after the epoxy is laid down, even just a few degrees it can "outgas" and lots of little bubbles will form. Best to wait late in the day but not so late that dew might form on the surface either.

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billy c
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Re: Help! air bubbles in epoxy

Post by billy c »

waving a heat gun over the wet resin should make the difference.
best to do less than more and watch for the result before getting the surface too hot ...don't need much heat to make it work
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Mr Hot Rod
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Re: Help! air bubbles in epoxy

Post by Mr Hot Rod »

After applying a light coat of epoxy with a foam roller, 'tip' the epoxy with a foam roller cut in half. Staple the roller cover to the end of a 24" long piece of 1" x 2". The tipping tool is lightly dragged on the epoxy surface until the tool starts to stutter. This breaks up the air bubbles induced by rolling on the epoxy and distributes a very thin coat of epoxy. You'll save many hours of sanding if you can minimize surface texture and runs !
  • Image
    Epoxy tipping tool on 10 ounce fiberglass cloth
Click here for more photos of the process.

Paul Kane
Kane Custom Boats Ltd.
Chelsea, Quebec

Building the Glen-L Hot Rod :

Glen-L Boat Video Directory : ... ctory.html

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