The black paint around the outside of your cars’ windshield is called ‘frit’. The frit band both hides the ugly sealant securing the windshield to your car and protects it from the sun’s ultraviolet rays which can damage the adhesion. – WTF Fun Facts
Source: https://jalopnik.com/heres-what-those-little-dots-are-on-the-edges-of-your-c-1791075995
