Wetwilly
I have been restoring antique tractors for years and always use Tallmans AG specialties Coatings which is Van Sickle enamel labeled for All states Ag Parts. I've talked to Van Sickle for custom colors.
The can doesn't specify what type of enamel. I don't know if they make both kinds. It thins and sprays really well, has a great gloss and I add the hardner. All of the tractors look great today. It's $33 a gallon.