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I'm going over some video that never made it to Youtube.... and I sure wish this one didn't get messed up. While rebuilding my rack and pinion, I had the camera in the sun - and it overheated. It was filmed on July 2nd through the 4th, so that will tell you it was probably fairly hot.
I used these in my motorcycle, but they are really small and pour in the valve stem when the Schraeder valve is removed.
I like the idea of the bigger beads; I went to check my tires last week and a micro bead got stuck in the Schraeder valve and the tire was going flat, lucky I was at home and hit it with some pressure and blew it back into the tire and it stopped leaking.
But made a mental note to only check them when I have an air source in case it happens again.
The bigger beads probably won't fit into the valve to keep it open.