So...some of my earlier papercrete efforts haven't weathered well and I've decided to refinish them using sturdier mortar. This is easily done by attaching some hardware cloth over the area. These new faces are made with mortar that includes sand, powdered clay, builder's lime, Portland cement, and a dollop of asphalt emulsion.This mix feels like clay and seems to hold up well. These old papercrete faces haven't weathered well. Fasten hardware cloth over the old. This mortar mix is quite workable -- feels like clay. This mortar recipe has held up well in other places.