hair spray worked for me. i poped the bead sprayed it on the tire so it ran like a bad spray paint job, filled it quick and it worked. it also works for hand grips that move. i wouldnt use fix a flat but thats me. a very thin layer of gasket sealer works to. if the tires have them pins that stick up, them little pieces on new tires. if thats in the bead it can also leak.