I've tried finding the leaks with the tire immersed in a tub of water, but no luck. Apparently the leak is so small and slow, it takes two weeks for the tire to deflate and with the weight of the tractor on it. The air bubbles don't appear in the tub of water.
Gempler's tire guard would seem to work, but it costs far more than a new tire. Ditto for the tire shop foam. BTW - I used Gempler's bullet proof grade tire sealant, and the tire still leaked after a few weeks.
Mr.Tuffy is great and what I'm putting on my Trek road and mountain bikes. I hate fixing a flat in the middle of a ride. They always seem to happen just before a thunderstorm moves in.
Not running over thorns is possible if my dog wouldn't drag the vines into the yard to chew upon. I also use the Cubs in the back woods to bring out firewood, and there are all sorts of stumps, twigs, etc that could puncture a tire. I tried to avoid them but often they are under a layer of leaves.
I'll keep looking, there has got to be a soft expanding foam out there, something like Nerf balls.
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