The old "cut-tape-draw arrows" approach. Needless to say, it's not at all professional. Sure it's faster, but your clients know it's definitely not better.

DIY programs take too long and have crude tools. The results are usually awful. Reps waste too much time on imaging, and less time interacting with clients.

You've waited 2 weeks for your imaging, and now the client's upset. So you decide to go to the jobsite and paint up samples. It's better than nothing, right?

You finally get your imaging, but they ran out of time to do any surface prep on it beforehand. You realize that this is not suitable to present to your client...