What polishing machine are you using??
One thing I have learned with the Dual-Action Porter-Cable, let the pad and the compound/polish do the work. While I THOUGHT some pressure is OK, there is a law of diminishing returns, and too much pressure will stall the DA-PC`s orbital motion, defeating its purpose. what this means is it may take 3 or 4 passes over a severely scratched area, an even then, if the scratch is too deep, it cannot be removed with a DA-PC. Pad choice of a foam type or microfiber is critical and may take some trial-and-error before the right one works, if at all. I start our with a white Lake Country or a tangerine Hydro-Tech and go up to a "stiffer" foam pad from there. If I can plainly see the scratch is somewhat deep and I have worked on that type of paint color of a particular vehicle manufacturer, I may start out with a more aggressive pad and compound. Paints vary in hardness and if an area on a vehicle has been repainted, it may not have the exact same type (make) of paint as the OEM paint, making the correction process more difficult to perfect and requires even more trial-and-error experimenting. I hate to bust your correcting process, but it is one of the reasons many professionals have a variety of pad foam types (manufacturers and density or stiffness indicated by its colors) and different compounds and/or polishes in their detailing supply arsenal to work with during the correction process. One size (process or technique) does not fit all (paint correction).
Because I do not have a true professional polishing machine, like a Flex 3401 or Griot`s Garage Boss G15 or Rupe`s Bigfoot MKII 15mm, or the skill and experience with a rotary polisher like a Flex PE 14-2 or Makita 9237C-X3, I must live with the "limitations" of the DA-PC, which also means sometimes you live with , as I call it, shiny scratches. It is what it is, but a DA-PC, even with limited pad choices, is infinitely better that trying to do paint correction all by hand, like many novice do-it-yourselfer`s attempt to do at home with vehicle detailing, as are the results.
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