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In response to your questions, here is what I do:
1. What to do between grades of compounds: Just make sure that you have all of the old compound off before moving to the next. Wiping off w/ a microfiber is good. I often add a spritz of QD and buff off with a fresh microfiber, just to get a really good look at the paintwork and to make sure that the surface is clean. Remember to use a fresh pad for each grade of compound.
2. Pressure: I use just enough pressure with my PCDA to keep the pad from spinning around... it really isn't much... probably less than the weight of the machine.
3. Paint cleanser vs. SFX3: To me, there really isn't much difference between SFX3 (it is 3 that is the finest grade, right... I can't remember off the top of my head and autopia's site is down temporarily) and paint cleanser. Maybe the SFX3 has a 'bit' more bite to it, but probably not much. You aren't going to get much effect from either on your scratches, or even swirls. You will have to bump up to the midgrade SFX2 to do that without spending 20 hours per body pannel.
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