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If your ok with using some glue and a scissors do a search on a member named mike mercury. He used an insulation from a hardware store, the article has all the how to do it pictures and instructions.
3M just makes the film. The brand name is Scotchgaurd Paint Protection Film. Wholesalers cut to specific applications and sell to the installers. The recomendation is to have a professional install it. You can find one on the 3M web site through this link along with anything else you want to know about the product.
I see your from Boston, I recently had mine done at a shop that was recommended to me in Natick. The guy did an excellent job and I would highly recommend him. For whatever reason, I don't see him listed when searching in MA on the website, yet he was at the time I had mine installed a couple of months ago. Let me know if you want his name.