I don’t use pens or touch-up bottles with brushes. They tend to leave a “blob” of paint. For my cars, I buy a can of spray paint from
www.automotivetouchup.com
The paints are always a good match, Mystichrome included. For chips, I spray the paint into the lid and apply it with a small brush. It is thinner/runnier than regular touch-up paint and allows you to fill the chip flush/level.
Regarding the black primer, I would not try to put any in the chip prior to filling it with paint. It will be more of a pain than what it is worth. The black will go up the “walls” of the chip and give you problems. If I was going to repaint a section, like a bumper cover or fender, I would absolutely use black primer. For a chip, I’d skip it and just fill with base coat paint.
I remember you posted this method a while ago and I started do it that way and it works. The thinner formula works much better.
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