Thanks for all the help. I combined all the advice, shake container of Hydrocal for 30 seconds or longer, closely monitored mixing instructions, no wetting agent, let it cure longer in the mold, try try again. I am getting better results. But I did get the Hydrocal at the LHS, in a "milk container" like box and it was on "sale" with 2 pricing stickers under the one on top...maybe a few years old. Next time I will get fresher product and store it in airtight container.
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