Move everything that is on and around the bathtub. Put on a face mask, goggles and gloves. Clean the surface of the bathtub thoroughly with an alcohol-based chemical cleaner, being careful not to allow the cleaner to come in contact with any surrounding paint. Rinse off the cleaner and allow the tub to dry.
Sand the bathtub surface by hand using coarse sandpaper; be sure to include the ledge and all the corners. This will help the paint adhere to the tub. Rinse or wipe off the sanded material.
Cover everything that will not be painted, such as the faucets and the drain, with masking tape; cover the floor with a drop cloth, secured by masking tape.
Follow the instructions in the kit for the epoxy paint. Before opening the paint, put on a face mask, goggles and gloves. Apply the paint quickly with a brush, beginning with the inside of the tub and finishing with the ledge. Allow the paint to dry 24 to 48 hours. Add a second and third coat as needed, allowing each to dry completely.
Once the tub has cured, put on a face mask, goggles and gloves, then follow the instructions for mixing the clear epoxy. Apply a thin coat of the epoxy to the surface of the bathtub. Remove the masking tape when the tub is completely dry.