Capt. Tolley's Creeping Crack Cure is a thin liquid sealant which finds and penetrates hairline cracks and sets to a clear flexible seal. To use Creeping Crack Cure area must be clean, dry and free from grease. Creeping Crack Cure can be used with wood, rubber, glass, metals, perspex, some rigid plastics, glass fibre, ceramics, concrete, brickwork and old sealants. Creeping Crack Cure is useful for jobs in the home such as leaking flatroofs and conservatories, window sills, kitchen worktops etc., as well as on caravans and boats.