Berryman Seal-R Tire Sealing Compound instantly seals leaks and protects pneumatic tires and tubes from small nails, thorns, and other sharp objects. Stays liquid permanently and uses innovative fiber technology to plug leaks and prevent loss of air pressure. Advanced corrosion inhibitors protect all types of wheels, including steel, chrome, and alloy. Seals porosity leaks in magnesium and aluminum composition wheels. Great for tractor tire ballasting.