West System 105 Epoxy Resin is a professional quality, two-part epoxy system developed for high strength and good versatility. 105-K Fiberglass Boat Repair Kits are designed for small, quick repairs for - Marine, Fiberglass Repair, Delamination Repair, Keel Damage and Small Laminate Hole. Repair Fiberglass Repair cracks and scrapes, gelcoat blisters, loose hardware, delaminated decks and panels, damaged keels and holes up to 1 inch diameter in solid laminates up to 1/4 in. thick, and smaller holes in thicker laminates.