I've heard that putting the film on your windows eliminates any warranty that you have on your windows. I would check about that first.
I have used a product called Quiltgard w/U.V Sun Screen fabric protector. I've had it for years. It is acid free. Can't tell you how it works, because I forgot I even had it until this post.
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Originally Posted by Jan in VA
There is a film purchaseable at Lowes which you can apply to the inside of your windows to block UV rays. It's reasonably easy to install, especially with 2 people, and does not seem to affect the light you want at the window or the view. I used to use it in my studio; haven't thought of it in years, now wish I had some more! Reds and navies seem to be particularly vulnerable to fading, btw.
Jan in VA