When I bought my VX last year I checked the air pressure in the tires and the right rear tire was hard to get air into. I had tires replaced today and that wheel had been fixed with Fix-A-Flat. The mechanic said the wheel was full of gunk and the rim had corroded due to the use of one of those fix-a-flat products. I have heard they shouldn't be used but this was the first experience I had with it. Mechanic recommends if you use it to get the wheel cleaned out as soon as possible.