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I was having problems with fading photos so I bought this product. I did a two week test by printing two of the same photo and putting both in the window for two weeks. One was sprayed with one coat of the krylon and one was not. There was a significant difference between the two photos after two weeks! There was absolutely no fading on the sprayed image at all. As expected, the non-sprayed image was very faded. I have read many reviews on this product that complain about the smell. It is no worse than any can of spray paint. It is an aerosol spray, I don't know what they were expecting.
Used for inkjet vinyl stickers. Two coats (first coat a light dusting, second coat a regular coat). If you final coat is too light, you get a satin texture. If it's heavier, you get a smooth gloss. If it's too heavy, you get blobs and drips. More coats may been needed depending on you application. A hair dryer on low turns drying time to less than a minute. 100% waterproof after it sets (a few hours, or until the odor goes away). I was able to cut out my vinyl 5 minutes after spraying without risking any damage to the clear coat.