a method of manufacturing a rust - proof , leak - proof and air - impervious welded tire rim by providing a pair of rim bodies each of which includes a peripheral bead and at least one of which includes a valve seat defined by an opening and with the rim bodies being welded to each other along an exterior circumferential weld ; liquid - cleaning the welded rim ; and applying to the entirety of all exposed surfaces of the rim an air - impervious coating of resilient copolymeric material whereby any porosity of the circumferential weld is sealed against air migration and the rim beads and valve seat are all totally coated with a resilient air - impervious coating for effectively sealing against air migration in association with a tire bead and an air valve body , respectively .