I hung patio lights on my screened patio.  Did everything you recommended.  Lasted two weeks and the last four days now a different strand got lose and came down.  I bought 4 sets of command clips 16 clips and 4 extra strips.  I don't want to keep going back for more strips.  I'll fight this a few more weeks and if it continues to come undone I'll have too find something else.  I love the xmas clips for sure.