I've heard the same thing about the traction compound, but I don't use any, so I know that's not the problem. We may have gotten a bad batch of And-1 foams at the local hobby shop, but that doesn't change the fact that this is giving me the red ass about J Concepts foams, I got way to much money in good tires and wheels to replace them and cutting tires off wheels to replace foams is not my idea of fun