Things You Will Need
Use a drop cloth to protect your tub and protective goggles or glasses for your eyes.
Touch-Up Kit for Minor Scratches
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Mix equal parts of hardener and catalyst in the mixing cup. Stir using the provided stick.
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Apply one coat and allow it to dry for about 30 minutes.
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Apply a second coat and let it dry for the same amount of time. Two or three coats should provide a nice, shiny coat of porcelain.
Porcelain Repair for Gouges
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Sand down the affected area by starting with 220-grit sandpaper to remove any loose porcelain flakes. Repeat the sanding process, each time using a finer grade sandpaper, until you reach 800-grit or 1000-grit. Sanding the damaged area in layers removes all of the imperfections.
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Vacuum the loose debris and rub the immediate area with acetone, using a rag.
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Fill the gouge with water putty--a waterproof filler--if the gouge is more than 3/8-inch deep. Apply the water putty with a plastic spreader and let it dry for several hours.
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Apply the porcelain repair kit hardener and catalyst (see Touch-Up Kit section above).
Repairing Deep Holes
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Mix equal parts of epoxy activator and hardener, using the provided bowl and mixing stick.
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Fill the holes with the epoxy mixture. The epoxy forms a strong base, replacing sections of missing porcelain. Let the epoxy dry for 48 to 72 hours.
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Repeat the sanding process as described in the Porcelain Repair section.
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Finish the job by using the porcelain repair kit from above. You may need more than one kit, depending on the size of the damage.