I agree with others. Not only for mess, but can make tires nearly impossible to balance as slime won't stay put. I don't know anyone who balances wheelbarrow or tractor tires.
wonder if it actually works to balance the tires!? Not much different than balancing beads, you have a heavy material that can move around inside the tire.
http://www.innovativebalancing.com/index.php
+1....nasty stuff.Have you ever seen the face of the guy mounting a new tire and finds the old one full of green slime?
They will charge extra to clean that mess up.
Don't think anyone is saying it's unsafe. The problem is the big mess it makes on the inside come the time to change tires. It gets hard and forms a "glaze" on the rim. Had to use a 7" grinder an a wheel to get the stuff off the rim before installing a new tireMy Ford Fusion hybrid comes with a12-volt compressor and a can of Fix-a-Flat. It has no spare tire or space for a compact spare. I have to admit I have not used either, but did have a flat that required installation of a plug. That was 30K miles ago - so Ford must not think the Fix-a-Flat repair is an unsafe repair. Green slime I am not too sure about, but for lawn tractors, etc - no problem.