I use urethane auto paint when I paint tractors I restore $$$. When I paint implements I use Wal-Marts Rustoleum Smoke Gray. Paint looks good and paints good and not expensive. Just thin it.It's as close to the old Ferguson Gray as you can get.If your just painting a tractor to use you may want to paint a small part and see if you like it. It paints alot better than Tractor Supply. I don't use Tractor Supply, it fades the first year. I've used all brands of paint.