adobe plaster finish indoors

Hi


We built a rocket mass heater and now after we finish covering it with cob we have to add the plaster finish to the bench and around the heater. I asked and read about it but i found there are many ways to do it, for instance, someone told me the mix is 1 part clay+water, 1 part glue, 3 parts fine sand, and someone else told me 4 buckets of clay , 4 buckets of sand, and 1 pound of glue. i will do small tests but what do you think is the best proportion for this application?






thanks

Leonard Allen : Cob and finish plastering are my two week areas, but I do have back ups, when my Cob Guru with 50 Middle Ages and Renaissance finish plasters in
his head is not available - like NOW ! I can always look in the Book by Ianto Evans' et al. 'The Hand-Sculpted House'. This works for me ! Big AL !