I too use the same shot sized cups to mix in.....but I use a cheap scale from HF to weigh the 2 parts. Sometimes I will even warm the etex bottles in hot water to thin it out a bit....and to start the curing process quicker once mixed. I have never had an issue with it curing rock solid.........except when I realized my etex was way over the expiration date. Might be something to check out. Especially after I had left the bottles out in the garage over the winter. Oh well....
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