I finally have one corner completely airtight and ready for plaster and “paint”, but first I will install a couple of shelves so I can empty some of the boxes I have on the floor.
Instead of paint I am using Alis, which is a thin clay slurry with some fine sand and flour paste added to help it stick together. There are various other binder ingredients one could use, but this seems to work fine so far.
I’m so happy to have a place to hang my pots and pans and store my edibles. I will soon have these shelves full for sure.
Desert Wilderness Community 
Looking good. Love that natural “paint.”