Shortly after buying my JD lawn tractor, it developed a very, very slow leak in the left front tire. I would have to put air in every week before mowing. I found a product I'm sure all you guys know about - "Slime". It's a suspension with tiny polyurethane bits and fibers. I had used a similar product Sears sold several years ago. Anyway, it's "squeezed" through a tube into the flattened tire with the valve removed (of course) before refilling air, then rolls around in there under outward pressure, filling any small punctures. They boldly claim it will seal up to 1/4 in. hole. I don't want to find out if that's true, but it worked beautifully for me - no more leak, and that was nearly 3 yrs. ago. I don't know if it is heavy duty enough for Boho's problem, but just thought I'd comment.