Some frosted glass sprays can handle the outdoors, but most of them aren't built for it. Sprays made for exterior use will say so clearly on the label. Anything marked “interior use only” can't hold up against rain, UV exposure, or changing temperatures without peeling, fading, or yellowing. Outdoor-rated sprays are typically more durable, but even then, proper prep and application matter. Before spraying anything outside, double-check the product instructions. If it doesn’t specifically mention exterior use, skip it. 

Whether window film is better depends on individual preferences and specific needs. In some instances, window film can be much less costly to install. Aesthetics is also a deciding factor. Window film may have a more significant appeal for design minimalists looking for a clean and streamlined look without the heaviness that comes with curtains. On the flip side, they can also appeal to design maximalists looking for creative expression in the form of color, patterns, and texture. Choosing between window film and traditional window coverings depends on factors like desired functionality, aesthetics, and personal preferences.

The best windows to tint are those that get the most direct sunlight—particularly sunroom windows or windows facing the south or east where the sun shines most brightly throughout the day. If your pets have favorite windows to lie in front of, you may want to consider those, as well, to protect their skin from sun damage.

The costs range from $5 to $15 per square foot, depending on the film type, UV protection level, and labor.