Mine is 3M going on 22 years now, still looking good. When applying, hold 2 to 3 feet of tape out away, then slowly apply, the longer you keep it, the straighter you can site down it. I went right over the door seams so the stripe would be straight from body across the doors, then sliced and rolled 1/2 on door and 1/2 to the body at each seam. Don't pull so tight you stretch it when trying to keep a straight line. We decal a bunch of school buses every year at work, our painter uses a 50/50 mix of water and alcohol when he puts on decals. It allows for some quick adjustments yet drys really quick. Soapy water also works but takes forever to dry out.
