Need respirator recommendations

Nearly fifty years ago I was doing some custom bike painting with acrylic lacquers and some enamels. Mostly candy paints, metal flake and pearls. Didn’t use a respirator then. I was just lucky I guess, and only did that for a couple of years before I broke down and bought a respirator. I worked in a body shop for a while (doing mechanical repairs only) and saw some old body guys (all heavy smokers, too) who got a little strange in their old age. All the new paints and processes have me kind of nervous, but I’m going to give it a try. I just want to be a little smarter than I was when I was younger.