California window tint law restricts windshield tint on top 4 inches. Front side windows must have 70% light transmission or more. Back side windows and rear window may have any tint darkness.

Smart tint, or smart glass, is a type of switchable smart glass that can change how dark or how opaque it is depending on the amount of light that is shining on it. This means that the glass can be clear when there is little light, and become darker when there is more light. Think of it as sunglasses for your building.

Since tint films are installed on the outside of your windows, you can use your windshield wipers after getting your windshield tinted. Be careful to avoid using any abrasives on your tinted windows for at least 4 days. Otherwise, you can scrape the tint film off of your newly tinted windows.

If privacy is your purpose for tinting, a 20% tint is an excellent choice. You can see through windows with a 20% tint if you're up close, but it's still difficult. Typically, it's enough to deter snoopers, though. When vehicles come with a factory tint, it's usually between 15% and 20%.