Okay, it's hard to rate this product. I would say based on the instructions and specs assuming the price is pretty low. However, I have searched the internet and many people say that you should leave it on for at least 48-72 hours. I tried 24 of our method and it didn't last, but when I left it for 3 days it got much stronger and worked as intended. So if you follow the instructions you will be disappointed. Just let it sit longer and you'll be fine.
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