Egon said:
My little tractor has a tubeless front tire with pinhole leaks causing it leak down over three or four days time. There was no tube available in town and needing the tractor I took it home any way. I put some dishwasher detergent into the tire vie the stem and it's been holding air ever since???
Egon, believe it or not, that's a trick that I've been used with drag racing slicks for a couple decades now. "Unsprung weight" (that is weight that's not resting on the springs, IE: tires, wheels, brakes) is a big concern with racers. The less a tire/wheel assembly weight, the faster/easier it can be put into motion. Tubes for a 14"-17" wide, 32" tall tire are really heavy (around 10-15lbs each!).
What we do, before mounting new tires, is pour dish wash liquid (Dawn, Joy, whatever) in the tire & coat the whole inside, spreading it with paper towels. After the tire is mounted & aired up, it may blow bubbles for a few seconds, usually out of the side walls (they are surprisingly thin in a slick). Then, a tire that may have only held air for 3-5 days (yes, we've done it on used tires) will hold air for weeks, or months. It's a good, cheap, trick & I'm surprised I haven't thought to bring it up here before.
Thanx for jogging the old memory!