I would have thought the sticky backing would give in to the power of the airbag being released.
Suppose it depends what model and what dash you have (3 or 5). I have the 5 piece, and the whole airbag section gets flipped up, so anything stuck to it won't be affected. See post number 3 on the below topic for a picture;
http://www.mini2.com/forum/general-d...ed-my-car.html 
