You can identify painter's tape by its blue color.
When amateur do-it-yourselfers attempt to refinish cast iron surfaces, chipping and shedding often ensue. Cast iron is a nonporous, slick surface, incapable of accepting new finishes unless you pretreat it with a special acidic base coat. This coating will etch the bathtub, leaving the surface better suited for adhesion. Once the tub is properly prepared, you should finish it with a paint formulated to provide an attractive glossy sheen and strong durability in the face of heavy moisture and duress.
Instructions
1. Scrub the cast iron bathtub with a trisodium phosphate cleanser using a coarse sponge. Rinse the cast iron with wet rags and wait between 2 to 4 hours for it to dry.
2. Cover areas next to the cast iron tub with masking paper, drop cloths and painter's tape.
3. Spray the cast iron bathtub with metal etching primer, maintaining a distance of 8 inches between the cast iron and the spray nozzle at all times. Wait 6 hours for the primed cast iron tub to dry.
4. Spray the primed cast iron bathtub with appliance epoxy spray paint, maintaining a distance of 8 inches between the cast iron and the spray nozzle at all times. Wait 8 hours before filling the tub.
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