This product did not do the job I wanted it to. Driving in Florida, I need extra shading on side windows early & late in the day. Unfortunately, this product does not stick at all to windows which already have shading film on them. It continually fell off, exposing me to the early morning and late day sun pouring into the driver's side window. (It did seem to adhere to plain glass when I experimented on the front window, which has no film on it.) The product also failed in another respect. It appears to be tinted film in the sales photo. It is not. It is a clear film with a matrix of heavy black dots...impossible to see clearly through and therefore potentially hazardous on a drivers' side window. Finally, it failed in another way. I wanted to use a small piece to shade my rear view mirror from the glare of tailgating SUVs and trucks. The mirror is plain glass, but the small piece of film that I cut to size for this mirror did not stick. It fell off immediately. It was a waste of money. I might as well hang a towel from the window.