Epoxy and humidity

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jbo_c
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Epoxy and humidity

Post by jbo_c »

Seems like I read/dreamed/made up that high humidity can cause issues with epoxy work. Is that right? - and, if so, how much issue?

Very high humidity this morning and rain later this evening. I’m working in an open pole barn. Should I hold off on epoxy work?

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Jaysen
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Re: Epoxy and humidity

Post by Jaysen »

You’re thinking of blush. It’s a byproduct of the chemical process in high humidity. It’s a yellow/orangey wax that will be present on the surface of the epoxy. Do NOT sand it. Remove with alcohol and a frequently changed rag. If left in place it will reduce adhesion between epoxy layers.

I built under a tarp in South Carolina lowcountry through a winter and summer. Use low blush epoxy (BBC is low blush) and clean frequently. You’ll be fine.

My wife is laughing. “You all need to stop embarrassing those boats and they won’t blush!” Yep. I married a good one.
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jbo_c
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Re: Epoxy and humidity

Post by jbo_c »

Beginning to look like it’s going to mist rain all day. That means I’m out either way.

Poop. Probably only a few more working days left before work is done for the year.

Jbo

joe2700
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Re: Epoxy and humidity

Post by joe2700 »

It depends on the epoxy as well. Some that usually cost more don't blush, so you should see if the epoxy you are using is susceptible before you worry about.

pee wee
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Re: Epoxy and humidity

Post by pee wee »

"Blush is water soluble and can be removed with an abrasive pad and water, after the epoxy has cured hard. 3-M Scotch-Brite® General Purpose Hand Pads or similar abrasive scrunge pads work well for abrading and dulling the shiny surface. Detergents and solvents are not required or recommended for removing blush."

Copied from here:
https://www.epoxyworks.com/index.php/mi ... ine-blush/
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