Am I Making A Mistake Here Here's a tip. When cleaning and prepping your surface for paint, you should also clean the surface that you will stick your tape to. For instance when back taping the door jams, I had to clean at least an inch all the way around the edge, that way the tape would have a good clean surface to bond too, otherwise it will fall off, especially when blown by compressed air from your paint gun. Same goes for the tape and paper I will put underneath the car along the rocker panel seam. The back of that seam is the dirties part of the car, so I made sure I cleaned it off the best I could. I may end up using duct tape on the back of it just for good measure. I don't know what I was thinking when I decided to use a long piece of used drop cloth to cover the roof and the already painted tailgate. Maybe it will be ok, maybe not. It was getting late in the evening, I put in a 12 hour day, and it seemed like a good idea at the time. Now that I think about it, won't the compressed air from my spray gun blow out any dust from the drop cloth out into the open and onto my newly primed surface. Am I making a bone head mistake?