I got a small 4 kg bag of white portland cement for $12, I guess I got lucky. My curing took about 4 weeks. I only made 10 pounds as a test. I kept the pieces in a 5 gallon bucket in my bathroom, each time I had to flush I dumped the water in the toilet and refilled the bucket. So a couple or three times a day. I really like the little caves I made in it, and so do my critters. I definately will make more.
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