Is painting bathroom ceramic tiles successful?
Usually not very. Tiles have a very hard surface that paint won’t stick to that well. It’ll look OK for a while but it will chip easily and tends to peel after awhile. If you insist you need to scuff the tiles first with something like sand paper, and then preferably use an aggressive primer to get some adhesion. IMO the tiles would have to be really really bad before a paintjob would actually be able to make them look better.