Tyre Shield® will seal most holes made by puncturing objects up to 3 mm in diameter in the tread area of tube tyres, and puncturing objects up to 6mm in diameter in the tread area of tubeless tyres as the vehicle is being driven. Tyre Shield® prevents rust, heat build-up and seals porous leaks and maintains tyre pressure. Tyre Shield® does not affect tyres and rims. Tyre Shield® helps to extend tyre life with a combination of maintaining tyre correct pressure and the prevention of heat build-up in the tyre.