After testing our previous samples, the boys and I mixed up another batch and applied it to the other side of the test bale (actually, it’s half of a bale because I sawed it in two lengthwise to double the surface area for our samples). 
For this mix we used 4 measures of sand, 5 measures of clay-dirt, four loose measures of chopped straw/hay, and enough water to achieve a nice consistency.
The surface of the bale to which we applied it had not been trimmed. So, it was quite rough. However, the mix was wet enough that we could press it into the bale quite well. The plaster sample is drying now. After it is dry, we’ll apply a second coat to it to see how well it adheres to the first. Applying the plaster by hand leaves a rough texture which is supposed to help the next coat to bond well with it.
It’s actually quite exciting to have the opportunity to use some of our own soil for the plaster on our walls. We hadn’t expected to be ab
le to do so – I was going to buy dry clay powder from a pottery supply dealer. I expect I’ll still buy some clay for the finish coat. We’ll use a white kaolin clay with some yellow pigment added. We’ll be figuring proportions out later.
If you ever get the chance, you ought to try putting some mud on a straw bale. It feels good in your hands, and it’s kind of fun.
I’ve been adding videos to my posts. I think there are things that can be understood and seen in a video which are hard to translate to text. So, here’s a video of mixing and applying our plaster sample:
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