The epoxy putty is specially formulated to maintain its adhesive properties when in contact with gasoline The epoxy putty is designed to harden in just 10 minutes and cure in 30 minutes for a fast and efficient repair Both radiator and fuel tank repairs can be made without having to drain the tank beforehand Repairs are permanent and do not require additional maintenance The epoxy putty, when properly mixed, will cure to a Grey color to match most oem fuel tanks and radiators