IPA is a wipe down using Isopropyl Alcohol diluted to something like 70% strength. Most polishes, etc have fillers in them which hide scratches. So when you're removing imperfections you might think you've got it 100% corrected when really the fillers are hiding the imperfections. Than in a couple of washes the filler is gone and you see a ton of swirls that just popped up out of no where.What is IPA?
Still haven't decided if it's worth it to invest in a orbital buffer. I did my last two vehicles in pieces starting with the areas behind the tires and the back bumper. Every time I washed it I did another section until I had the whole thing done.