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Fix-a-flat's problem(or the biggest one) is that when you inject the foam into the tire a substantial amount remains in the valve stem. It's a pressure valve and your are injecting something that expands rapidly into it. it gets clogged very quickly. And then the obvious problems are. . .it doesn't really plug the tire.
It's useful in a situation if you do not have a spare, you cannot get your vehicle jacked up, or for some other reason you cannot get a different tire on. It does not work for more than a few miles so really its like putting a tourniquet on and running straight to the hospital(only if you are within 5 minutes of the hospital).
Oh, My Del Sol doesn't have any A/C and has no problems with defrost. De-fogging on the otherhand. . . In the summer when its raining I open the backwindow and turn the slider to cold and that usually does it. Not that its actually cold air, but the combination of change of pressure by vacuum and flow keep the water from condensing on the glass.
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