Quite true. That is just what I am trying to do with my van.
AIO as a cleaner/prep, followed by UPP, then more UPP about every 30 days, Gloss Enhancer weekly. Started this in December, 2002, seems to be working fine for me. My plan is to do the AIO about every 90 days, then back to the UPP. The van still looks good even though I have run a month or so over my planned AIO application. I'm beginning to think every 6 months would be often enough for the AIO.