Waterproof: The surfboard repair kit is waterproof and can be used in any water conditions. Fiberglass Compatible: The epoxy resin is compatible with fiberglass surfboards for easy repairs. Standard Size: The kit comes with a 4 ounce tube of epoxy resin for standard surfboard repairs. Easy Application: The epoxy resin dries quickly and can be applied with a brush for easy repairs. Durable: The epoxy resin provides a strong, durable bond for long-lasting surfboard repairs.