Having just had my bath gutted and remodeled, in large part do to a crap refinishing job in the tub and shower by the previous owner sometime in the past I can honestly say I don’t recommend it. The epoxy, or whatever the hell it was that they sprayed all over the tile and tub had started flaking and was seriously disintegrating at the tub drain. It was god awful.
It’s all I can do to stop from punching in the face those idiots trying to hawk this crappy service in Home Depot.