Plaster recipe?? · Cob & Natural Building School

Plaster recipe??

Hi, I built this outdoor shower with cinder blocks and stucco. I want to add cob walls around it. It has no covering. I am unsure if I should add portland or lime to the cob mix (or both) and what would be a good recipe or mix for plaster? Can hydrated type S lime work or does it have to be hydraulic? The climate is dry Northern Arizona. Thanks!

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