Eliminates dangerous welding. Complete kit contains everything required for making professional-quality permanent repairs in just minutes. Includes state-of-the-art components and easy-to-follow instructions with photographs to make quick permanent repairs to leaks in all types of metal fuel tanks. It repairs cracks up to 4" (10cm) long and holes up to 3/8" (9mm) in diameter. Repair will be complete when the resin cures in 30 minutes. Tank may be refilled after 30 minutes or when the repair is tack free. Repairs can be made ideally at temperatures from 50° F to 75° F (10° C to 24° C). Repairs made at lower temperatures will take longer to cure. (THIS PRODUCT IS NOT FOR USE ON PLASTIC FUEL TANKS).