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I recommended he cut back the size to 17.5" front and 14" rear to simplify the install of the decal. the sill is bending up a a bit by the ends of the decals and its a bit tough to install.,not impossible but a newbie will have a issue . I did and I have done window tint, decal trailers and have done a trans am hood.
No squeegee, I didn't use a heat gun, came close to a blow dryer. I prepped with rubbing alcohol and used the water and dawn. A few letters wanted to stick to the tape, maybe I didn't wait long enough. the R and the / are the toughest. both probably can go forward 1/2" which will help. but once they are down and squeegeed they are flat and stuck. I have 2 more to go and have to do my friends.