I'm not sure I'd want any tint film on my windshield. Adding 78% VLT tint on a windshield will result in blocking about 30-40% of light (depends on the % VLT of the bare glass). Great on hot days, but not great at night. I have 35% VLT film on all my side windows, but nothing on the windshield or back window.
Understanding Tint Percentages | Diversity Auto Films