Capt. Tolley's Creeping Crack Cure. Finding and Fixing Cracks and Leaks Couldn't be Easier. This low-viscosity copolymer sealant detects, seals and bonds hairline cracks in every type of boat-building material. Capt. Tolley's formula is different from other sealants because it finds it's way inside cracks by capillary action and sets to a clear, flexible and permanent seal. A 2 oz plastic squeeze bottle. Finds and fixes leaks without hassles. Seals hairline cracks. No dismantling required. Saves time and effort.