BigKev wrote:
Late on this, but my 54 wheels were so crusty they wouldn't seal and leaked air. I had them media blasted clean to remove any trace of rust, then primed with epoxy and painted inside and out.

The '54 rims are different as they were made for tubeless tires.

Marty or Marston wrote:
My preference for sealing two metals where you want a great seal with some flexibility is to use a polyurethane caulking compound (Home Depot). Of course, the key to success with any of the products mentioned above is a good, clean surface. There is also automotive seam sealer found in paint stores that specialize in auto paints. It has great adhesion propertied with some flexibility.