Glass sealant is used on a vehicle to provide a protective coating to the windscreen and other glass surfaces. There are several benefits to using glass sealant on a vehicle:

Increased protection: Glass sealant creates a barrier that protects the glass from contaminants, such as rain, dirt, and grime, which can cause streaks and make it difficult to see through the glass.
Improved visibility: By repelling water and other contaminants, glass sealant can help to improve visibility, making driving safer and more comfortable.
Easier cleaning: Glass sealant can make it easier to clean glass surfaces, as contaminants are less likely to stick to the surface.

Overall, using glass sealant on a vehicle is a simple and effective way to protect the glass and improve visibility and maintenance, making it a worthwhile investment for car owners.