Use one bottle per tire. Air must be deflated in tire before installing. Use valve stem core remover and remove core from stem. Remove cap cover on Flat Reduction bottle and snip cone shaped applicator to allow fluid to be squeezed out. Place provided tubing over cone and then attach to valve stem. Squeeze entire contents into tire and replace valve stem core. Re-inflate the tire to its proper pressure. The contents will fill any holes in tire during movement. Use in off road vehicles and trailers only.