Four Thieves are legit. Controversial but they’re confronting a lot of uncomfortable truths that need to be addressed .

Windshield screens are the low-tech but far more effective method of keeping a car’s interior cooler, typically by at least 20F when it’s really hot out. Slightly inconvenient but unlike this paint, a windshield screen will actually make a difference.

My vote goes to The Vanishing (1988).