If you drop the pressure at the track to where they work best, you will need to keep an air tank close by to top off before the next run, or on the way home. Mine always leaked slowly, regardless of soaping, just because when they wrinkle, it always weakens the rubber somewhere and starts a slow leak. If you let the car sit, it is always best to raise the rear and install jackstands to keep them from collapsing from a leak. Now, some folks never lower the tire pressure to the point that they wrinkle at launch, so I am not going to speak to that. Mine always leaked slowly over time, that is why I went to radials. Joe-JDC