Up for sale is a high-quality cooling system leak seal manufactured by Weldit and made in USA. Weldit Lead Seal is scientifically formulated to mix with your vehicle's coolant. Tiny fibers and metal particles seek out the leak and are "welded" together by sealing resins to form a permanent seal. It comes in one vial with a net content of 20 grams. This leak seal works on all types of antifreeze and all kinds of radiators for cars, trucks, motorcycles and other industrial vehicles.