Bartop epoxy- tacky with dustnibs

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Forum topic by mayday3374 posted 07-23-2018 01:52 PM 351 views 0 times favorited 4 replies Add to Favorites Watch
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30 posts in 862 days

07-23-2018 01:52 PM

Topic tags/keywords: epoxy bar top dust in epoxy resin

Good morning everyone. First time working with bartop epoxy, Im guessing I was off on the ratio a bit. 12 hours after the pour, my top is still tacky. I see that a repour would normally fix this. But to complicate things, I ended up with quite a bit of dust in my first pour. It is dust, not bubbles. I figured I would just sand it out when it cured but it has not cured as hard as I was hoping. Any advise as to what I should do? Thanks for your time

4 replies so far

View RobHannon's profile


330 posts in 1140 days

#1 posted 07-23-2018 01:59 PM

I’d give it 48 hours before trying to do anything to fix it. It may harden up enough to sand out the dust.

View Rich's profile


5152 posts in 1199 days

#2 posted 07-23-2018 02:33 PM

If it was not fully mixed, it’ll never set up. I had the same experience recently where I was mixing a large batch to fill a void in mesquite. I filled the mixing cup too full and it made it hard to stir thoroughly. Apparently I had some unmixed material in there because after I poured it, the surface stayed sticky. I left it while I worked on other pieces and after several days the situation hadn’t changed. Fortunately it was a deep void and that was just the first pour, so I was able to wipe it clean and pour more.

Anyway, acetone will clean off the stick part and get you down to cured epoxy. I can’t guarantee that what you get down to will be hard enough to sand though. Getting an inadequate mix just screws everything up.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View mayday3374's profile


30 posts in 862 days

#3 posted 07-23-2018 03:37 PM

thanks guys. I couldn’t wait another 2 days as I am on a timeline. I ended up wiping with acetone and it helped a lot. The epoxy was tacky on surface but stable enough to allow me to wet sand w/ 400G to remove the dust and level it out.

View CaptainKlutz's profile


2260 posts in 2103 days

#4 posted 07-23-2018 03:37 PM

+1 More time before sanding.
Epoxy cure time is highly temperature dependent. Can require 3+ weeks at room temp (72F) for slow cure epoxy to reach maximum hardness. Raise temperature 25 degrees and time is reduced by 75%.

+1 Inadequate mixing can cause this problem and it really, really stinks when it happens.

Another difficult problem with epoxy cure is inadequate temperature, coupled with high humidity conditions:
If temp is low (<70f>80F <130F). Higher your humidity levels, higher cure temp needed to avoid sticky top layer.

Best Luck.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

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