get the proff. stuff and prepping the surfaces correctly is the key to long lasting adhesion.
I had an Oem AP1 spoiler being held by 3M and it was a very strong bond & p.i.a to remove.

 

im about to install my strakes today, so hads the 3m tape holding up well, or have you guys come up with any other way? and where can I find this " real 3m moulding tape" at?

 

http://www.amazon.com/s/ref=nb_sb_noss?url...3m+molding+tape

the last two digits in the model numbers are pretty much either different thicknesses or widths.

I held on a really heavy spoiler on another car with just the tape only and had a really hard time taking it off when i was going back to stock about 4 years later.

 

So I did the install, I bought the 3m tape,and also I bought some self tappered screws, I jacked my car up took the back wheels off , cleaned the area with alchol , then I mocked the strake on the side on the body, and self tapped into the inner rear fender wheel there is like an inch of metal thats covered by black fender lining (not the side of the car like oem), once I got the holes top and bottom drilled I took the strakes off then cleaned again and applied the 3m tape around the edge of the strake, put it on the car then screwed the two self tapped screws top and bottom into the fender well again... repeat for other side, so far so good

 

Update??