Do absolutely follow the installation guide, and order a bit more than you need to screw up the first one (you will... not wet enough, too many microbubbles as it wasn't clean enough).
Does it work? Yes.
Not a miracle solution, but it is definitely cooler and feels less aggressively hot with it even though the sensors I have only show a few degrees lower.
Prestige 70 Ultra Solar Control Window Film
from https://www.abodewindowfilms.co.uk/
Do absolutely follow the installation guide, and order a bit more than you need to screw up the first one (you will... not wet enough, too many microbubbles as it wasn't clean enough).
Does it work? Yes.
Not a miracle solution, but it is definitely cooler and feels less aggressively hot with it even though the sensors I have only show a few degrees lower.