To prime or not?

[osx]

Decided to repair some scratches on the front wing but during sanding I found more layers of paint. Looks like the previous owner had done some paintwork which he didn't tell me about.
I started sanding with 400 and finished with 800 grit.
I was planning to just spray the base coat and a few coats of lacquer but not sure how this would work with the other paint being there.

[GiveMeABreak]

It already worked once as you've only just noticed the old paint after taking the top coats of paint off - so I would just put on the new paint and lacquer as long as it's clean and grease free.