So there i was gluing up my new coffee table (thread here) about half way done with all the gluing. So i stick the brush into the cup with the epoxy and it won't go in, as if some invisible barrier was there. So i poked it some more and realised there was a clear disk on top, the whole exposed surface had hardened, from liquid to hard within probably 10sec. I pushed the hardened part aside and kept gluing, then 10seconds later the whole cup starts to smoke/fume so i set it aside so i wouldn't be breathing these fumes and I noticed the cup is super hot (exothermic reaction obviously). So i panic and run around the house to fill in a bucket of water and then throw the whole cup and bruch in there. It would have started a fire otherwise.
Anyway the question is what the hell caused the reaction. I mixed the ration for the epoxy as started by system west.(5:1). The hardener was a 206 slow hardener. The only thing that i can think of is that the brush was previously used for PVA but had obviously been cleaned pretty well since. Could trace amounts of pva make the 50/100ml of epoxy react like that?
Here is a pic, the one on the left is the bad batch, the second one on the right was ok, i used a different brush on that one just in case. The bad one went from liquid to solid within ten mins...probably more like 2mins really but i didn't want to touch it til i was sure it was done.
IMG_20140403_174942.jpg
Anyway the question is what the hell caused the reaction. I mixed the ration for the epoxy as started by system west.(5:1). The hardener was a 206 slow hardener. The only thing that i can think of is that the brush was previously used for PVA but had obviously been cleaned pretty well since. Could trace amounts of pva make the 50/100ml of epoxy react like that?
Here is a pic, the one on the left is the bad batch, the second one on the right was ok, i used a different brush on that one just in case. The bad one went from liquid to solid within ten mins...probably more like 2mins really but i didn't want to touch it til i was sure it was done.
IMG_20140403_174942.jpg
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