MasterCraft boats, however, start with its “paint”—a protective, pigmented resin-based coating called gelcoat—and proceed from there. Every MasterCraft boat starts with layers of gelcoat, the opposite of how cars are built. Fiberglass, resin, and puzzle piecesWorkers use fiberglass chop or fiberglass sheets. “They might have up to six people rolling out the fiberglass resin to remove any potential defects. And be thankful that even if your MasterCraft boat can take such a beating, you don’t have to.