... drying out or embrittlensess TOP BEST-668 Automotive gap-filling butyl sealantUsed in the car tunk,door frame skeleton EPDM seal ... groove. 1,DescriptionTOP BEST-668automotive gap-filling butyl sealant is a type of netural, one-component ,permanent non ... ,StorageStorage temperature: 0°C-40°C,12months. Automotive gap-filling butyl sealant