Prepping for paint correction (a couple of chips)

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2016.5 CX5 GT AWD w/ Tech pkg
In another month or two, once the weather is sunny for several days, I plan to fix a handful of paint chips that need correcting. Code=34K, Crystal White Pearl Mica, 3-stage (undercoat, midcoat, clear). Most are "dot"-sized. A couple are greater than 1/8" but less than 1/4" in diameter. And one is a bit more than a half-inch (where the paint looks like it flaked but the undercoat still seems solid).

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Question:
Got recommendations for your best process for preparing the surface?

Am particularly interested in experiences with correctly preparing the "chip" area to get all surrounding creeping decay/rust nearby that chip. Want best approach to fully halting/converting minor rust in such chips. Best method of applying the paint? What's your particular experience?

I realize that the different companies will each have a somewhat different method they suggest.

Haven't decided yet on the provider (Dr. Colorchip, or whomever).

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R&E Paint --

Dr. Colorchip --

I.L. Motorsport --

Automotive Touchup: they supply a groundcoat, midcoat and separate clearcoat --
 
Honestly, with 3 stage colors, if you’re not an experienced painter, best to use a body shop. Even then you are apt not to be fully satisfied with the results. More than likely you will end up painting tons more of the car than you think you will. As an insurance adjuster, I never wanted to adjust a 3 stage color claim. Especially white pearls.
 
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