Just tinted the windows today with Huper Optik 40 in the back and Huper Optic 60 in the front. Noticed so far it looks a little green in certain light. I have slate interior, so the back windows appear darker because they are smaller than the front and also smaller than the rear window. Have to wait and see a little more for final judgment. Huper Optik 30 in the back may have been better, but maybe not. Anybody else have Huper Optik? What's the verdict?