I purchased a gallon of the stripper, just in case I needed to do any clean-up, but didn't need any of it. I just made sure I didn't try to apply too heavily at a time. Pay close attention around obstructions, i.e. window frames, latches, locks, etc; It will want to "over-apply" or "collect" and run. I just made sure that I paid attention to it and gave any areas that were attempting to run a quick wipe of the rag before the run tried to "set-up". The first coat seemed most apt to run, although maybe I just got better with my application technique with each successive coat.
Since my roof is one piece aluminum, there was no need for a coat on that area, other than the fiberglass cap on the overhead bunk area. That, too, got 3 coats.
The nice thing about how easy this goes on is that for a yearly touch-up coat, I could do the entire MH (after washing) in less than an hour, without any "elbow grease". I'll probably go ahead and add the 4th coat that most people recommend this weekend; again, I only need about an hour to do it! :)