i did a little poking around looking for a solution, and ran into something similar to what youre talking about.Idk if you ever got the air leak fixed, but I had a bend in a rim on my last car. Colony Tire added some sort of sealant between the tire and the rim and it never leaked after that. I have no idea what they used, but you might be able to search for some bead sealant, but then you have to remount the tire...