Rather than spray something that you will inhale, why not look into virtually invisible sheets of film you can add to your windows that block UV rays, sort of like they do on car windows, but not as dark. I've used them for years; find the product at Lowes/Home Depot, apply it yourself fairly easily.

Jan in VA

How about solar screens? You can see out but they keep the sun out AND people can't see in(kinda a safety thing there).

Thanks for the information everyone! I knew there would be a few options with all the knowledge on this board. It's great!