Fiberglass Boat Repair Kit

Fiberglass Boat Repair Kit
Fiberglass Boat Repair Kit

Repair cracks and scrapes, gelcoat blisters, loose hardware, delaminated decks and panels, damaged keels and holes up to 1″ diameter in solid laminates up to ¼” thick, and smaller holes in thicker laminates. Each Fiberglass Boat Repair Kit contains eight packets of WEST SYSTEM 105 Resin and 205 Fast Hardener, fiberglass fabric, adhesive filler, fairing filler, glue brushes, mixing pots, a reusable mixing stick, an application syringe, three pairs of protective gloves and illustrated instructions for completing a variety of common fiberglass repairs.

All components are contained in a sturdy, resealable package that can be easily stowed aboard your boat.

105-K Fiberglass Boat Repair Kit, 1 kit

105-K Fiberglass Boat Repair Kit Instructions (pdf)

105 Epoxy Resin Safety Data (pdf)

205 Fast Hardener Safety Data (pdf)

406 Colloidal Silica Safety Data (pdf)

410 Microlight™ Safety Data (pdf)

745 Episize Glass Tape Safety Data (pdf)


Read more about repairing fiberglass boats, including the repair of transoms, machined holes, rudders, skins, stringers, bulkheads, floors, backers, cracks at the leading edge of the ballast, interiors, damaged personal watercraft, gelcoat blisters and more at


Minor Fiberglass Crack & Abrasion Repair

Repairing ground out damage

If the damage is the result of a scrape or gouge, or cracks were exposed with a grinder, complete the repair as follows:

Open shallow and minor cracks with a “V”-shaped scraper, such as a sharpened can opener.

Grind out an area of many closely spaced or deep cracks with a disk grinder.

Minor cracks and scrapes that extend to the chopped strand mat layers of laminate may be repaired with WEST SYSTEM Epoxy.

Scraped out damage

After exposing the cracks using a “V” shaped scraper, complete the repair as follows:

  1. If cracks were exposed with a “V” shaped scraper, complete the repair as follows after preparing the damaged area as described above:
  2. Feather the edges with the scraper or with 100-grit sandpaper and brush the surface free of dust and loose material.
  3. Wet out the cracks with a 105 Resin/hardener mixture. Then fill the cracks with a 105 Resin/ 205 Hardener mixture thickened to the consistency of peanut butter with 406 Colloidal Silica Filler. Apply the mixture with the flat end of a mixing stick.
  4. Trowel the epoxy flush with the surface and remove excess epoxy before it begins to cure. Allow the epoxy to cure thoroughly.
  5. Sand the area smooth. Use 100-grit paper to remove any bumps or ridges. Finish by wet sanding with 220-grit.

Finish the area with gelcoat or paint.

Reinforce the laminate as necessary to reduce flexing.