GTechniq - Car Care Products - G1 ClearVision Smart Glass - 15 ml Description Unlike regular rain repellent coatings that adhere to the surface of the glass using relatively weak physical bonds, G1 uses a chemical bond which gives G1 unrivaled durability. G1's excellent durability and exceptionally low smear characteristics make it ideal for car windscreens. Please note that with glass coatings there is a trade off between durability and functionality.