Hi,
I am helping my boss apply molded concrete textured stone on his family room wall. We have spread the base mortar and it is dry. Today we started applying the stone. We are using a portand cemet mix with clean fine sand.
I don't know, but I believe that mortar is like creme brule (i.e., very sensitive). It demands crystal clean water and just the right amount of mixing. It should be used fresh and spillage shoud never be thrown back on the butter board for reuse. The boss (perhaps he would skin a flea for its hide and tallow) is like a busy bee scoping up spillage and mixing it back in our fresh mortar.
I know it is his mortar and his wall, but I would apprecriate some corraboration that his miserly habits may result in unstuck stone falling on his beautiful Italian tile floors. Thank you.