How do you tint a BMW M6 convertible rear window?

Answer 1: Use a sharpie for the bottom. Cut an oversized pattern on a peel board. Dropping the roof may make it easier to tint the rear window. Line up your bottom edge with the dot matrix. Pull the sweeps and use an Allen key to manually get that rear window as high as possible. 

Answer 2: Tape the inside and tint from the inside with the roof up. Bottom feed the window and make sure your slip solution is extra slippery.