veneer. The job is fairly simple, existing 400 square foot concrete poured patio about 5 years old. Has one marginal crack towards left edge but overall looks to be done well , good grade slope pitched away from house and my understanding is the slab has grid in it. Customer would like to have flagstone laid on top of the existing slab which is generally an easy job and music to my ears. The problem is the slab has been painted with 2 coats of some type of paint/sealant and I certainly don't want to lay on top of that. My question is what do you guys recommend? I really don't want to come through and score the slab, but I was wondering would a coarse sander work if any of you have experience with something like this? Some type of walk behind belt sander that wouldn't leave the the slab smooth as a babies butt, but rather coarse and would strip the majority of the paint. Any suggestions would be greatly appreciated and feel free to tell me my sanding idea is stupid, it's just my initial thought.