How to Resurface a Fiberglass Sink

Sand the fiberglass, or the new surface coating will eventually peel.
Sand the fiberglass, or the new surface coating will eventually peel. (Image: Jupiterimages/ Images)

If your sink is worn or mismatched, a new surface coating can transform it into one that looks brand new. If the sink is made of water-proof fiberglass, employ specific prep strategies that will ready it for application. Fiberglass sinks require an acrylic base before they'll take on a new surface coating. Unfortunately, primer will not stick to fiberglass, because it is too slick. Scour the sink with sandpaper before you apply the base. This will generate a coarse area better suited for acrylic primer.

Things You'll Need

  • Trisodium phosphate cleaner
  • Coarse nylon pad
  • Rags
  • Towels
  • 180-grit sandpaper
  • Professional painter's tape
  • Masking paper
  • Acrylic spray primer
  • Epoxy spray finish

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Prepare the Fiberglass

Wash the sink, or it won't accept the fresh surface coating. Scour the fiberglass with trisodium phosphate, using a nylon pad.

Rinse the sink with rags. Unseen trisodium phosphate residue may inhibit adhesion. Thoroughly rinse the fiberglass, or the new surface coating won't stick.

Dry the fiberglass with towels. Sand the sink to ready it for its new surface. Slick fiberglass won't accept new coatings; roughen the sink to improve its adhesive qualities.

Resurface the Sink

Cover the adjacent countertop and nearby areas of the wall, using masking paper. Don't just lay the paper on these surfaces. Tape it down, so it can't blow free.

Condition the sink to accept its new finish by coating it with an acrylic spray primer. Improper application methods will cause sagging. For neat results, hold the spray tip 8 inches from the fiberglass at all times. Let the sink dry for two hours.

Add the new epoxy surface coating. Apply it just as you did the primer. Let the new surface dry for three hours before turning on the faucet.

Tips & Warnings

  • Wear a respirator if you are resurfacing a bathroom sink.
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