How to Bondo a Sink

Create a mixture of 1/4 cup baking soda, 1 tablespoon liquid dish soap and 1 cup warm water. Stir the ingredients and apply a thin layer of the paste to the affected area with a kitchen sponge.

Work the baking soda mixture into the cracked, chipped or broken fiberglass sink with the kitchen sponge, using overlapping circles.

Rinse the baking soda mixture away with warm water. Dry the sink thoroughly with a soft cloth.

Put on a pair of sturdy work gloves before cutting a piece of fiberglass cloth to fit the affected area. Stir the Bondo fiberglass resin and hardener, which are available together in a kit, according to the size of the damage. The 3M (makers of Bondo) website suggests approximating the amount of product needed and mixing it accordingly by giving an example of combining 6 tablespoons of resin with 1/4 teaspoon of hardener in a plastic container.

Lay the chunk of fiberglass cloth onto a piece of newspaper or cardboard. Dampen a small paintbrush with the resin/hardener mixture and apply it to the fiberglass cloth. Carefully lift the cloth and lay it over the damaged area. Press the fiberglass cloth into the sink with your gloved hand.

Apply an additional coating of the resin/hardener over the fiberglass with the small paintbrush. Allow the resin/hardener to dry for at least two hours, or until it’s no longer sticky to the touch.

Sand the repaired area until its flush with the surrounding sink with 80-grit sandpaper. Wipe away the sanding dust with a tack cloth before covering the repaired area with a light coating of epoxy-based paint. Allow the paint to dry for at least 24 to 48 hours before using the sink.