I have tried many of these products. This is by far the best. Most work well but need to be reapplied every hour or so. It works very well and seems to last at least a day or two. (I didn't actually test it further as I keep reapplying it.) I think the trick is to get your glasses really clean (as instructed) and then reapply them with no other films on your glasses. I am very impressed.
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