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Bartop epoxy- tacky with dustnibs

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Forum topic by mayday3374 posted 07-23-2018 01:52 PM 331 views 0 times favorited 4 replies Add to Favorites Watch
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mayday3374

30 posts in 706 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

RobHannon

299 posts in 983 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

Rich

4697 posts in 1042 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.

-- My grandfather always said that when one door closes, another one opens. He was a wonderful man, but a lousy cabinet maker

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mayday3374

30 posts in 706 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

CaptainKlutz

1638 posts in 1947 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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