Rustoleum under Orange II from an HVLP spray gun sprayer works great and is very satisfying. On a bucket, and I am now painting mine, Orange II with a spray gun and no primer really works just as well. It's a bucket and is going to get beat up is what I figure and I'm fussy. Kubota rattle cans are great paint but hard to get a good looking job on a large flat surface. It's just the way it is. You can buy a low-buck Harbor Freight spray gun and even a small(ish) compressor used judiciously with bulk paint will do a fine job. There are lots of threads on this.
Kubota Orange II is a beautiful acrylic enamel and well worth the effort to spray correctly. Practice first ad study up.
If you are a newbie at spraying it's OK and there's a fast learning curve. In a few minutes you can do an excellent job if you research it first and ask some questions. I learned and my wife calls me unteachable...