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Tub or shower wall tile preparation: Apply a layer of 1/2â³ thick cement backer board to the wall studs. Tape any seams and corners with fiberglass tape. Apply thin-set adhesive over the fiberglass tape, and allow it to dry. Roll a waterproofing sealer over the walls, and allow the sealer to dry.
Removing Porcelain Bathtub Stains. The most common type of bathtub to get rust stains is porcelain. Porcelain is a heavy stone-like or metal material that is very durable. Since they are so sturdy, removing porcelain bathtub stains can be as easy as using abbrasives on the rust.You can try some abrasive powders such as Comet or Ajax and a scouring pad.Just sprinkle some powder on the stain, add a little water and scrub. This will work for small rust stains that are just beginning.ince they are so sturdy, removing porcelain bathtub stains can be as easy as using abbrasives on the rust. You can try some abrasive powders such as Comet or Ajax and a scouring pad. Just sprinkle some powder on the stain, add a little water and scrub.