hail damage

When water is chilled it expands, but when metal is chilled it shrinks and when its heated it expands. The way dry ice works is that it pulls the metal tight thus pulling the dent out. This method is not always successful and can be harmful to the paint. The method most dent repair companies do is working the dent up from below using metal rods and working the area to make it flush. To make it visible for repair many will use flourescant bulbs and put black pinstriping on the bulbs and this creates a image on the paint job. You can view this image and look for the pinstripping being wavy which shows the dent is not yet a smooth surface.