Cast Iron Kitchen Sinks – First clean the sink with a mild, non-abrasive as Softscrub or Bon Ami. For stubborn stains apply the cleaner directly on the stains. Allow the cleaner to sit overnight and wipe out. Evaluate the sink. If stains and other imperfections disappear not visible, you can choose to leave the sink as is and skip the remaining steps. Second sand the sink using a palm sander and medium grit sandpaper. A palm sander can be purchased at any store home improvement. Use soft sand basin around a circular motion. Wipe away any sanding dust with a damp cloth.
Third apply epoxy primer using a good quality brush. Use a uniform even with sufficient paint to prevent brush marks but not much paint puddles in the sink movement. Avoid fading at the end of the stroke to prevent paint marks visible. Allow the primer to dry completely. Forth paint with an acrylic finish using a brush. Use the same technique you used to apply primer, avoiding visible strokes. Allow the top layer to dry completely. Last wait three to five days before filling the sink with water. For regular maintenance and cleaning cast iron kitchen sinks, use a clean, soft, non-abrasive cloth.
Tips & Warnings to refinish an old cast iron kitchen sinks:A number of companies offering professional finishing sink and bathtub. Consider getting a quote from a professional before tackling the job yourself. Getting the perfect finish can be difficult and may be better left to someone who is very experienced.