I bought these tiles to go over existing ceramic and painted drywall. I cleaned the surface with the suggested cleaner and have had great results! They look great and were so easy. I even had to peel them off a few times to get them lined up and they still stuck great. No peeling or anything and it's been about a month. Well worth saving the mess!! Only complaint is they are a little pricier than I would have liked for a stick tile but still a great product!