No. The process only affects the outer most layer of the glass. This will in no way damage your windows or make them weaker. In addition, the VIN number etched on each piece of glass is only ¼” in height and approximately 2” in width. The numbering has a white color that can be seen within a few feet of your vehicle. Thieves and police officers know where to look for the etching, however, the casual passer-by will not notice.