Ralph...

Are you sure it's the rims leaking? As an FYI,we ran bias tires on our drag car years ago and we always coated the inside of the tires with Dawn dishsoap. Don't dilute it. Just pour some in the unmounted tire and roll it around to fully coat the entire inside of the tire. Let it dry overnight and then remount. If we didn't do this our slicks would go flat overnight. After the dishsoap they could set for a few weeks with no loss.

BTW,the cheapo hillbilly chrome in a can works great for sealing the inside of the rim. Have someone blast the Glyptal off and then give it a couple of heavy coats.

It's all we used at the motorcycle shop I worked at and we never had comebacks for leaking wheels. Bike tires are so small any leak lets the tire go flat in a couple of days...

Chris