Get the inner part of the wheel bead blasted down to bare metal and paint them with a thick coat of a 2-part epoxy type polyurethane paint like IMRON. Unless the rivets are loose, the paint should seal up any leaks there might be due to an imperfect fit of the rivets.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!