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The legal premise involved here is common law whereby it says that he who is at fault must pay for the harm. If you were painting and a gust of wind caused your paint to fly and damage a car, legally you are liable and this is why contractors carry liability insurance. The liability is only to put the damaged property back to the condition it was at the time of the damage. Thus, if you could get the paint removed from the car then that is the extent of your liability.
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