Originally Posted By: eljefino
I use this when necessary:
Best practice is to polish the rim seating surface. If your tire has been mounted before and has chunks of rust on its bead rubber try to get that off of there, maybe with a scotchbrite pad. Less is more; polish too much and you cut through the thin rubber and are down to the bead wire, which you definitely don't want to expose.
But sometimes one just has to kludge it with this goop. For example, bead leaks where I want to break the bead but not unmount the tire, I sneak in there with the goop and its little brush and go crazy. If it holds, it holds.
Supposedly it revulcanizes old, tired hard rubber as well.
I have a jar of that exact stuff. For me, it's a last resort sort of thing. Unfortunately, when you go off roading and deflate the tires, having beads that don't leak isn't a possibility. Or when dealing with junkyard sourced wheels from a 2000 model year car ... They just corrode so badly once they get to a certain point that I would be breaking them down every month.
I'm not sure what Walmart uses but it's like rubber cement. I have never had a problem when using X Tra seal but the walmart stuff lifted the F350 right off the ground when trying to break the bead using a jack under the hitch!