Recommendation:
Don't use the 3M I had it installed on 2 cars, an Audi Allroad and my wife's new Mercedes SLK, both looked like a they had bad case of Orange Peel. After less than 500 mile on the SLK the film split, the company who installed it said it was a rock chip (NOT) and was unwilling to cover replacement under warranty, so the local Mercedes dealer who had it installed refunded the our money and quit doing business with them.
We went with a product called Clear Shield I think this is the web site
http://www.clearshield.com/index.cfm/fuseaction/Product.Home, it is very hard to see and so far with 4,000 mile we have had no issues. In my research I also heard good things about a product called Llumina???, a quick Google search did not show any sites so I must have spelled it wrong. Unfortunately there was not an installer in my local area.
A word to the wise stay away from any 3M products for paint protection.