Permatex offers premium repair kits for professionals and DIYers that contain everything required for making quality repairs in just a few minutes. This fuel tank repair kit includes state-of-the-art components that will repair leaks in all types of metal fuel tanks on cars, light trucks and commercial vehicles without welding. It is developed to repair slow leaking cracks up to 4 inch in length and holes up to 3/8 inch in diameter. Repairs should be carried out ideally at temperatures from 50 degree Fahrenheit to 75 degree Fahrenheit. Repairs made at lower temperatures will take longer to cure. The repair resin is designed to harden within 8 - 10 minutes and cure in 30 minutes. When the resin fully cures, the repair will be complete. The fuel tank may be refilled after 30 minutes or when the repair is tack free.