I love slime it works great. I buy it by the gallon at Tractor Supply for 20 bucks a gallon. I put a quart in every tire. I hear you are supposed to replace it or add more every two years? In my riding mower My pasture is full of horrible thorns even some nasty 4 inch long red ones that get over 1/4 inch at the base. I see the little green spots where it sealed up and rarely add air. So the slime is definitely kicking *** in my mower tires. My Bighorns are very tough I have not seen any holes in a thousand miles.
As for balancing it helps it out if anything just like a Centramatic hubcap. We all run slime here and run up to 70mph on the roads glass smooth.

 

Well, slime doesn't freeze at -10 deg. F. I put a half full gallon jug of HD Slime in my freezer, along with a thermometer. 36 hours later the Slime was still just as liquid as when I put it in there and the thermometer was -10 F.