1964 Valiant "Get Runnin & Drivin"
I believe Rustoleum Safety Red is what they call Synthetic Enamel. You can put a Synthetic Enamel Hardener in it and make it much more durable and holds a shine lots longer.. Dries quicker and and easier to work with. Does not stay wet as long either so less dust gets in it. Don't leave it in your gun overnight as it turns to Jello the next day and continues to harden throughout.
If you run the paint it will set up in a couple days so you can sand the run out. Without the hardener, if you get a run it stays like gum for a month, and if you put it out in the sun too quick it will wrinkle cause it takes a long time to dry it down to the base without the hardener.
All John Deere Green tractors use synthetic enamel from the factory. I have always used the Synthetic Hardener with it. Those are expensive tractors and they want nice finishes put on them, that match too.
The synthetic enamel hardeners are starting to get harder to find, but I still buy the 5132 5star Xtreme Synthetic Hardener on ebay.
Other hardeners are not compatible with synthetic enamel, it will curdled on you if you try.
Dupont had a really good synthetic enamel hardener 77-S, but they discontinued it.
Around 35.00 a pint
As with all auto paints know what you are mixing up, spray a test panel and make sure things come out like you want. You can get a feel how it sprays out of the gun too.
All the new automotive finishes are big bucks, reds are most expensive too.
Crazy Expensive . . .
I prefer the better paints, comes down to what you feel you can spend.