Just a suggestion, make sure if you're using Meg's UC and UP to do IPA wipedowns to get rid of the filler and see what you're really correcting. If you were doing the whole vehicle at once it wouldn't be too big of a deal, but since you're just doing one panel at a time and washing it weekly it could be problematic.
By problematic I mean by the time you get the last panel done the filler will have washed away from the first panel you did and it will look like you hardly did anything to it, thus creating a seemingly endless amount of work. If you're doing it one panel at a time I would really recommend going with a product with no filler such as HD Uno followed by HD Polish or HD Speed. Speed is by far my favorite polish because it gives you a durable wax and real correction at the same time. Saves me a lot of time when I'm doing other people's cars or my own.
HD products aren't OTC but you'll be much happier with the results by waiting the week or so it takes to be delivered. You'll be amazed at the quality of products available once you stop limiting yourself to OTC solutions. It will save you quite a bit of money in the long run too (for instance: diluting ONR and using that as clay lube is WAY cheaper than buying Meg's QD or the like for clay lube.) If you're only doing your own vehicle you'll find that soon you'll just be ordering a thing or 2 here and there to stock back up instead of constantly going back to wal mart or the auto parts store spending way more than you intended to lol. Don't get me wrong, Megs ultimate is a good OTC line, I still use it when someone wants to pay me very little for corrections (I always let them know what they're getting and that there are fillers in the Meg's products,) but it's not exactly up to par with the other products available to us.