The rear lip spoiler on my SL55 is driving me crazy. The driver's side corner keeps coming loose. Over the winter I removed the spoiler completely, removed the old tape and put new tape on the underside. I waited for a nice warm day and re-installed the spoiler. Yesterday I noticed that the same side is coming loose again. Does anyone have any suggestions as to how to keep it attached? I would like to fix this without removing it again.

Thanks

 

3M auto tape and they make a pre-treatment wipe (adhesive promoter).