Choosing shade by appearance alone
Night visibility, factory privacy glass, interior color, windshield conditions, and net VLT all affect the result.
Comparing only “IR rejection”
Manufacturers may use different test ranges. Compare full specification sheets and TSER where appropriate.
Ignoring glass compatibility
Residential and commercial glass systems can have coatings, laminates, seals, and thermal characteristics that require a compatible film.
Cleaning too aggressively during cure
Follow the provider’s written aftercare instructions, including the recommended wait before rolling vehicle windows down.