I've heard of a similar product, but under a different name (don't remember it right off). It's not very effective in light truck tires as it is on larger truck tires. I have a freind that tried it on his lifted Z-71 w/ 36" Swampers, it worked ok at highway speeds (65+) but not very well at lower speeds. Ended up taking the stuff out and doing a traditional balance, no vibration troubles since.
