i´ve heard if u whash your car with high pressure water and flush directly on to the tires between the rubber and the rim,the water will force it´s way in.If u drive at 100km/h and want to stop the car u will break,but the rubber just spins arround the rim.

jonas

two things

Good Myths and Get Firefox it has a spell checker

Original,
Jonte's English spelling is way better than my, and, I suspect, your, Swedish.
It would have to be a heck of a high pressure, as it would have to exceed not only the tyre pressure, but the mechanical stiffness of the sidewall plus any friction between the rubber and rim. Any liquid that did find its way in would likely live at the outer periphery of the tyre, being flung there by centrifugal force, so would not remain near the join.
There are instant tyre puncture repair aerosols available that shoot liquid rubber glue into the tyre via the valve, which then gets dispersed by motion and forced into the hole before setting.