Thick gelcoat areas on fiberglass boats lack reinforcing fabric, making them prone to cracks when under stress. This stress can occur during mold removal or through years of flexing. Aging gelcoat becomes hard and brittle, increasing crack susceptibility as a boat. Professional boat lettering and custom signage to enhance identification, branding, and style on the water. Explore waters through our enjoyable pontoon boat. Troubleshooting fiberglass composite cracking issues can seem daunting, especially when you're dealing with materials known for their durability and lightweight properties. Fiber-reinforced composites combine the best characteristics of plastic and fiber, making them a popular choice in various. These materials are characterized by their anisotropic properties, with fibers providing strength and stiffness in specific directions while the matrix transfers loads between fibers and protects them from environmental factors. Fine hairline cracks (crazing) seen on the hull can be merely cosmetic, or they can signal a structural issue. Hinge Effect: The hull flexes at points where a flexible area meets a very rigid support (e., where a bulkhead is bonded to the hull).