We live in Northern Arizona (30 miles south of the Grand Canyon). We will be building a small earthbag building and want to render exterior walls with earthen plaster (sand and clay with straw fibers). Because we can experience monsoon rains in the summer and snow in the winter, we believe a breathable paint is what we need. I have been told we cannot lime plaster over earthen plaster for water resistance and finding your website online leads me to believe breathable paint is our answer. I just want to be sure it will adhere properly to cured earthen plaster. Also, I would like info where to purchase. Thank you for your help.