OK, team...need your help. I purchased a replica roof wing sppoiler for my E60 from carking on ebay which attaches to the top of the rear window. The tape does not hold, so I took it off. The wing does not lay flat. It hugs the window in the middle, but does not sit on the ends. Two questions -

1. I read somwewhere that you could heat them up a bit which will allow them to seat better. Anyone have any advice here? How do you do that?

2. What is the strongest tape to use that I can get locally from an auto shop?

 

It's probably a good idea to let a body shop install it. If the tape didn't hold they can use a very strong glue and heat it so the fit is perfect. Expect to pay around $100.