Cast iron claw foot bathtubs are intended to be a mix of old charm and new shine, but when the tub looks and feels weathered, with green water marks under the faucet and by the drain, nasty dings on the lip of the tub and a dull, gritty texture from years of improper cleaning you might think that there is no way to get back to the new shine part of the equation. Repairing a cast iron claw foot tub may seem impossible at first, but it is a process that you can complete yourself. instructions 1.1 Apply cleansers one and two, in order, from your kit, to the surface of the tub with a sponge. Your refinishing kit should include cleaners, adhesor bonding agent, primers, reducer, catalyst and acrylic gloss paint. 2.2 Rinse the cleansers off of the tub and dry it with a towel. 3.3 Inspect the cast iron for any major damage around the feet, along the tub walls and the base of the tub. If there is any cast iron repair that needs to be completed, before repairing the surface issues, contact a cast iron repair specialty company for an on-site consultation. 4.4 Remove the drain cover and cover the faucets with masking tape. Place a painter's tarp under the tub, around the claw feet, to protect the bathroom floor. 5.5 Repair any small dings, chips or scratches by applying a porcelain repair paste onto them with a small paint scraper. Allow the paste to dry for two hours. 6.6 Attach coarse 36-grit sandpaper to your palm sander and sand the repaired tub surface area. Wipe the tub with a damp towel to remove the sanding dust. 7.7 Attach a sheet of intermediate 80-grit sand paper to your palm sander, sand the repaired area and a 3-inch area around the repair to blend the repaired surface with the tub surface. Wipe the tub with a damp towel to remove the sanding dust. 8.8 Sand the entire tub surface with a sheet of 140-grit sandpaper on the palm sander, to roughen up the surface. Wipe the tub with a damp towel to remove the sanding dust. 9.9 Apply 2 to 3 ounces of adhesor bonding agent, from your repair kit, to a paper towel and wipe it onto the tub surface. Allow the bonding agent to air dry on the tub for five minutes. 10.10 Maximize the ventilation in the room by opening any windows or doors. 11.11 Put on a respirator to protect yourself from the primer and paint fumes. 12.12 Mix the primer components, included in your tub refinishing kit, per the manufacturer instructions. 13.13 Pour the mixed primer into the paint pot of a high-volume, low-pressure spray gun. 14.14 Test the air pressure and paint flow of the paint sprayer by spraying a small amount of the primer mix onto a piece of scrap wood. 15.15 Using the wand of the spray rig, start at the top of the tub and spray the primer mix onto tub with a horizontal back-and-forth overlapping motion. Release the spray gun trigger at the edge of the tub to avoid overspraying. Allow the first primer coat to dry for 30 minutes before applying a second coat. 16.16 Clean the paint pot of the paint sprayer by spraying it thoroughly with the spray from a garden hose. Allow the spray rig paint pot to dry for 30 minutes. 17.17 Fill the paint pot with acrylic top coat, from your kit, and spray the tub with three coats of paint, following the horizontal back-and-forth motion utilized with the primer. Allow the coats to dry for 30 minutes between applications. Allow the paint to cure for 24 hours before removing the tape and tarps and replacing the drain cover. 18.18 Remove the tape and tarp and replace the drain cover after the paint has dried for 24 hours.