I'd love to do something to beautify my bathtub/shower walls. I live in an old trailer, & there's some sort of board with "marble" design that is faded, gouged, etc. covering the walls. I am building a house that I hope to be in in the next year or so, so this project needs to be fairly simple and cheap. I've looked in Lowes, & they have white bumpy plastic stuff that's as ugly as what I have. My water is extremely high in iron, turns everything rust-colored quickly, so the surface must be smooth for ease of cleaning. I've got tile I've stockpiled, but don't want to use it due to having to clean all those grout lines. I've thought about marine paint, but not sure if this would work. Any ideas?