Determine the color of your porcelain tub. In some cases this is an easy task while in other cases this may be a rather difficult chore. Contact manufacturers of professional porcelain tub refinishing kits for a color match. You may do so using email. If you cannot make a positive match, consider refinishing the entire tub rather than just repairing the chips or scratches.
Purchase a professional refinishing/repair kit. Remember that the kits sold in stores generally lack strength when it comes to bonding the product to the tub. Be choosey and spend your money only on a product that certifies its professional strength and applications.
Clean the bathtub and remove any soap scum, debris, or other buildup of matter that may cause the adhesive and coloring agents not to stick well to the surface.
Spot clean with acetone the areas which need to be repaired. Pour a bit of the substance on a piece of paper towel and gently rub it over the surface. This ensures maximum adhesiveness of the bonding materials. If you do not have pure acetone on hand, nail polish remover will do.
Open the windows in the bathroom. It is crucial to have good ventilation when working with bonding agents and paints. Since bathrooms are usually some of the smallest spaces within the home, failure to ensure proper airflow may result in dizziness, fainting, and breathing problems.
Read all of the instructions the manufacturer includes with the kit. Compile all the items ahead of time you foresee needing . As you are working on repairing your porcelain tub, some steps will need to be taken in rapid progression and having to first search for an item can greatly decrease the effectiveness of some of the exposed chemicals.
Start your actual repair work early in the day to allow for the drying times. This will allow you to finish the entire process in one day. Starting too late may cause you to not get done until the next day.