I have a painted stone wall that is not very attractive. I thought stuccoing over it could solve the appearance problem. Would I need a wire mesh? Could I stucco right on the stone? Would I need to remove paint or treat the wall with some type of wash to help the stucco adhere?
Painted stone will not provide any adhesion for the stucco, and you'll get an uneven surface. You will need to use some masonry nails and a firing hammer and peg up some expanded steel over the stone. Aim for where the mortar is, assuming there is some.