You need to remove the tire and wheel, inflate the tire to the manufactures specified pressure as stated on the tire, submerge the tire/wheel into a water bath, inscribe a mark on the wheel and a mark on the tire at the valve stem, remove the tire from the wheel, use number 80 grit sandpaper to scuff the inside of the rim surface at the leak area and general purpose cleaner such as 3M(R), P/N 08984 or equivalent, to clean the leak area and apply 3 mm (0.12 in) thick layer of adhesive/sealant, GM P/N 12378478 (Canadian P/N 88900041) or equivalent, to the leak area. Then you can allow for the adhesive/sealant to dry, align the inscribed mark on the tire with the valve stem on the wheel, install the tire to the wheel, pressurize the tire to 276 kPa (40 psi), submerge the tire/wheel into a water bath, inflate the tire to the specified pressure as stated on the tire placard, balance the tire and wheel and install the tire and wheel.
By BobGM Specialist
28/10/2022