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 Post subject: sticky epoxy
PostPosted: Tue Oct 07, 2014 9:04 am 
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Joined: Sun Jul 20, 2014 7:01 pm
Posts: 14
Location: Lumberton, Tx
Question: How long do you wait on a sticky epoxy before deciding to sand it off and start over? I am at around 40 hours now and the last batch is still tacky and leaves fingerprints everywhere you touch it. I know i measured right. The only other possibility is the minor cold front that blew in a few days ago. Low temps dropped to the 60's, highs are still right at 80.


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 Post subject: Re: sticky epoxy
PostPosted: Tue Oct 07, 2014 9:38 am 
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Joined: Fri Jun 18, 2004 8:14 pm
Posts: 4855
Location: Greensboro, NC
40 hours should be more than enough even for slow cure.

If you have a heat gun or hair drier, CAREFULLY warm a test area so it's very warm to the touch, let it sit for about an hour, and see if it's still tacky. If so, you'll have to scrape it off.

You might want to try a small test batch of epoxy on scrap wood again. If you're 100% sure of the mix procedure and it's still tacky, you should contact the place you bought it from.

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 Post subject: Re: sticky epoxy
PostPosted: Tue Oct 07, 2014 9:54 am 
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Joined: Sun Jul 20, 2014 7:01 pm
Posts: 14
Location: Lumberton, Tx
I am almost through the first gallon and this is the only batch to do this. I know it isn't a manufacture issue. I did go a little thick on this coat.
Might that be the problem?


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 Post subject: Re: sticky epoxy
PostPosted: Tue Oct 07, 2014 11:19 am 
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Joined: Fri Jun 18, 2004 8:14 pm
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Location: Greensboro, NC
Perhaps. Get some heat on it and see it that helps.

As a precaution, I'd get a fresh mixing cup and applicator (or a good wipe down of both with acetone). Just in case you got something in there the epoxy didn't like.

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 Post subject: Re: sticky epoxy
PostPosted: Tue Oct 07, 2014 2:24 pm 
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Joined: Mon Sep 12, 2011 6:29 pm
Posts: 138
Location: Chicago
Not even the slightest chance that you put in too much hardener?
Has your epoxy mix cured successfully on previous parts of the boat?
If you're using slow hardener, In those 40 hours, how many hours were in the 60s?


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 Post subject: Re: sticky epoxy
PostPosted: Wed Oct 08, 2014 5:13 pm 
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Joined: Sun Jul 20, 2014 7:01 pm
Posts: 14
Location: Lumberton, Tx
All previous mixes cured within 6-8hrs. Something just wasn't right with this batch. Overnight with 1000watt work light still yielded sticky mess. I tried the heat gun too. No luck. I attempted to scrape it off but I am using SS@G method and the WRC just did not want to turn loose of all of that sticky epoxy. I tossed the affected parts and planed some new strips.


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 Post subject: Re: sticky epoxy
PostPosted: Wed Oct 08, 2014 8:16 pm 
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Location: Greensboro, NC
Dang. But at least you caught it now. :roll:

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