How much paint would I need for a 'refresher' so to speak
will go the sane colour. So door jams and under the hood won't need to be touched

Mostly for faded paint, and chipped wheel wells and rockers are really bad.

I mean approx, 2 gallons? I don't know, but I want to get a quote. I got access to all tools necessary. I'll probabl bondo and smooth places like the wells, and small dents here and there.