heres a post with some PM's and answers, I've been getting a lot recently:
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You should definitely buy a piece and work with it. I don't know of any good walkthroughs, and I'm sure either this thread or another by some BMW guy is as good as it gets, not to mention I'm here to ask questions to.
Squeegee- use a felt-tipped one, it won't leave any scratched
heat gun- for MATTE vinyl expecially, DO NOT use too much heat. a hair dryer is plenty! use it on high heat settings
taking care of it- right now, not really.. its been covered with snow/salt for a month, it all just washes off. BUT do not use: automatic touch carwashes (the ones with the swinging brushes etc), wax, anything that'd scratch the vinyl. Normal hand wash with a sponge and dry with towels is perfect, or a touchless car wash. normal soap is fine.
yes, matte vinyl shows finger prints/oil/smudges easier than regular paint, as you'd expect. washes off just the same, though. In the summer i was anal about finger prints and would always keep a towel and some isopropyl alcohol handy to remove them
f you want to know what vinyl is like to work with, buy a sample of the vinyl first to try it out. I used some boring oracal vinyl which doesn't have the quality of the 3m and its really tough to work with.
I got mine through a NJ distributor that my friend worked at, unfortunately they don't work there anymore though. see if you can just order the vinyl through a shop and be nice and maybe they'll help you out on that.
I will find pics of my seams. but in short- I cut clean edges, and then overlapped them by half an inch. I only needed seams on the A and C pillars, and on the hood scoop inlet.
I never cut on the car, and brought a flexible plastic "cutting board" that I could slide under and cut on