DAP Auto/Marine Sealant is a one component, acetoxy cure, 100% RTV silicone rubber that seals and bonds for automotive and marine maintenance and repair applications. It provides a long lasting, waterproof seal that stays flexible and won't crack or shrink. It resists vibration, expansion and contraction. Once cured, it is unaffected by temperature extremes (-40+ALA-F to 400+ALA-F).