I bought these yesterday and followed the directions on the package. Cleaned the area on the  metal siding trim I stuck them on beforehand and then put them on. Then put the lights on. Worked great.. or so I thought. I strung all the lights up. Wonderful.

Three hours later 1/2 the clips were unstuck and my lights were hanging down.

It was strange because after I stuck them on, I tried to move them and I couldn't budge them.

I have used the inside versions of this and it works well. The outside, doesn't seem to  work too well.