The plaster samples we applied to a test bale earlier took a while to dry because the bale was in the garage without much air movement. They did dry fine, though. So, I took the bale outside yesterday afternoon and, with the help of some fine younguns, tested how well they adhered to the bale and their strength.
Both samples dried nice and hard. They really adhered to the bale well – no problem there. The mixture that was 2 parts sand and 1 part clay had a grainier texture, and sand could be rubbed off of its surface. The addition of wheat paste might have helped bind it together a bet more making it less likely for sand to rub off. I hope to try a sample with wheat paste soon.
I made a short video documentary of our testing process:
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