How to Apply a Gel Coat


Gel coat is a thick paint made from fiberglass resin. Pigment is added to the gel coat to match any color. Fiberglass requires a catalyst in order to harden, and because gel coat is fiberglass, it, too, will need a catalyst to harden. Because of the consistency of the gel coat, you must spray it from a special spray gun. You can also paint gel coat with a regular paint roller, but you won't get a professional finish this way. You can find fiberglass and gel coat materials at your local marine supply store.

Things You'll Need

  • Fine-grit sandpaper
  • Palm sander
  • Air compressor
  • Rag
  • Acetone
  • Painter's tape
  • Small bucket
  • Stir stick
  • Gel coat
  • Hardener (methyl ethyl ketone peroxide)
  • Gel coat spray gun
  • Scuff the fiberglass to be painted using fine-grit sandpaper and a palm sander. Sand any rough spots on the fiberglass until the entire surface is smooth and scuffed.

  • Plug in the air compressor, and blow all the dust off of the fiberglass. Clean the surface using a rag and acetone. This removes any grease or oil residue that can cause the gel coat to bond poorly or not at all.

  • Cover any decals or windows with painter's tape. This prevents overspray from getting in the wrong places.

  • Mix the gel coat and hardener as directed using a small bucket and a stir stick. Add the paint to the spray gun as instructed in the spray gun manual.

  • Spray the first coat of gel coat onto the fiberglass in a heavy mist. For the best results, apply the gel coat as evenly as possible. Let the first coat begin to harden, and then apply the second coat.

  • Spray the second coat of gel coat onto the fiberglass, solidly covering the surface. Continue to spray as consistently as possible to avoid any runs. Let the gel coat cure until it's fully hardened.

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