I recently used paint from Summit Racing... same for my epoxy primer. I didn’t have a proper set up, nor an official shop.
In my garage, one of those self contained turbine paint guns (Wagner brand), and this epoxy/paint. Epoxy came our fairly well... However the paint was rough. I put it on thick and was able to smooth it out quite well with 600, 1000, 1500, 2000 grit sandpaper. It’s driver quality, took a lot of work, would have probably turned out better with a real compressor/spray gun.