To paint a bathtub, use a commercial lime remover to clean the tub, then wet-sand it to deglaze the finish before applying a dedicated tub and tile paint. The process takes about 8 hours, but requires 2 more days for the new finish to cure.
- Clean the tub
Remove any stick-on, non-slip strips applied to the tub. Purchase a commercial lime remover and follow the manufacturer's directions to clean away any hard water build-up from the existing finish. Rinse away the lime remover before proceeding.
- Sand the finish
Use wet-dry sandpaper to remove the glossy finish from the bathtub. Keep the sandpaper wet while working, and rinse away any loose material from the finish.
- Mix the paint
Follow the manufacturer's directions for mixing the paint. Some of these products are two-part epoxy paints that require mixing to harden. Mix only the amount of paint you are able to use before it dries.
- Apply the paint
Use a brush to apply the paint. Keep all brush strokes in the same direction. These paints are self-leveling, so any air bubbles that form or brush strokes that are visible disappear as the paint dries. Apply the paint in two thin coats, spaced about one hour apart instead of a single thick coat. Allow the paint to cure according to the paint manufacturer's directions.