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  #1  
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Tacky West Systems Epoxy

Ok, me thinks I screwed up.
Sanded the tiller and four teak hand rails that I removed last fall from the roof of my cabin and pop top. Stained them; let dry 24 hours.

Yesterday AM I added a coat of West 105 /205 and set them outside on our apartment balcony to dry in the shade and eventually the afternoon sun. It hit about 18C.

I have the metered pumps on resin and hardener.

One batch of 105/205 did all but the last 8 footer so I did a 2nd batch for that last one. It developed little bubbles...like bugs inside were blowing bubbles.

36 hours later they are still a little bit tacky.

I will give them another day but I am sure all is not right.

Any ideas of what I should do next? I hate to have to sand them down again because that tacky resin will be a PITA.

I was planning 1 more coat of resin and then several of SPAR varnish for UV protection.
Thanks.
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Re: Tacky West Systems Epoxy

Oh crap...
Looks like I am removing it all...but I will let cure for a few days inside warmth of apartment first.

Epoxy Problem Solving | WEST SYSTEM how to use guides
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Re: Tacky West Systems Epoxy

For some reason it seems you have mixed a bad batch of epoxy. Perhaps you did not deliver a complete metered dose; or perhaps you did not mix it (typically mix for about 60 seconds to ensure an even mix). Gentle stirring, not a whisk! Overenthusiastic stirring can introduce bubbles, as 20 seconds of beating does not equal one minute of stirring...

I would scrape as much off as you can now, and then try and wipe the remainder off with acetone. If you are lucky that will remove most of the epoxy. Then let it dry for a few days, lightly sand and retry. There are many variables, but if you leave it a few days it may harden - but more likely will remain tacky, and be even harder to remove.

Normally epoxy is wonderful stuff, but every now and then a batch goes wrong...good luck!
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Re: Tacky West Systems Epoxy

So what do you think you did wrong..?

Might want to leave them an extra day or two in the sun (or maybe a heat lamp) to see if they "kick"...
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Re: Tacky West Systems Epoxy

I agree with Paul323 re scraping and acetone. Acetone is good for dissolving uncured epoxy. But first, I'd try brushing a coat of hardener on the tacky part and giving it a day or so to see if that hardens it off. I've had luck with that but it was in places where the finish wasn't as critical.
You can probably get the best advice from the manufacturer if you shoot them an email from their website.
John V.
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Re: Tacky West Systems Epoxy

Two part epoxies are very temperature sensitive, especially at their initial kick-off. The standard West System mix of resin and hardener won't kick-off below about 60 or 65F if my memory serves me. If they are too cold initially, you'll never get them to harden.

I worked in boating supply and would have customers complaining about bad hardener every spring. You just have to heat the garage/workshop to the correct temp.
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Re: Tacky West Systems Epoxy

. In my experience when coating fresh wood with epoxy, the first coat will have to be sanded pretty well as the wood of gasses causing small bubbles.
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The 205 hardener is actually their cold weather epoxy. Cure temps allow for around 35-40 degrees based on their temp charts. 206 and 7 hardeners are >50. Might have just been a bad mixing job, but the second post suggests he found his error
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Re: Tacky West Systems Epoxy

Did it get damp overnight when setting?
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Re: Tacky West Systems Epoxy

I've had a similar issue, not in a visible space. It hardened, eventually. Like three months.

I tried brushing on hardner, with no effect.

It's all magic if you ask me. No advice outside drinking more. You are not alone.
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