I bought two of these to use a very large screen (30" x 47"). I felt that two large hangers provided better stability than a very large Command hanger. My canvas has been hanging on the wall for over 2 months now and is doing great. Humidity doesn't seem to have a negative effect on the hangers - I went about three days without air conditioning in temperatures in the mid 90's; Even though my house got very humid/hot, these Command hangers didn't lose their grip on the wall. Installation, like any other Command product, was very easy. It was a bit difficult to balance the level between the two hangers due to the shape at the top, but otherwise no problem. Tip: Be sure to follow the instructions to get the best performance from this type of hanger - you really need to let it hang on the wall for at least 30 minutes before hanging your canvas on it. I've learned in the past that the command hook isn't strong enough and can fall off the wall within a few months if you don't do it this way. If you follow the instructions, this type of hanger will last for years, and when you take it off, the paint won't peel off. Having spent a decade in the apartments, I consider myself a certain commando expert!
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