Doing a color change is a lot of work to go through and not straighten the body.
But, that is your choice to make.
These newer two-part and epoxy paints are too expensive to put over dented sheet metal and isn,t going to give the look you want.
If I'm not mistaken, the look you are after isn't a look at all. You want people to look at it and not think it needs painted or that it was just painted.
I knew a guy, years ago, that was painting cars for iron lots. He would shoot them, take the paper off and drive down the street to the automatic car wash. If it still looked like new paint he would send it through again. He was using synthetic enamel which is slow drying. The car wash didn't have a real high pressure spray and the scrubbing wheels just knocked the shine off.
From your post it sounds like you are going to take it to a paint shop. Tell them what you want. Use the cheapest, slowest drying paint they can get. Do everything that you shouldn't do to new paint. Have it painted on a windy day, drive home through a construction zone and let it sit out in the sun dirty. Wash it with a shop wrag. You'll be very happy.
I'm getting a little carried away, but I think you get the idea.
Like the other guys said, white and light colors are your best choice. I think the flattening additive would be too much. It's usually used for lower body moldings and bumper areas.
Ok, I've had enough fun for one day. I have to find an EGR problem on my daughters car.
