enamel paint options

I was wondering if using the enamels that are for painting tractors and implements any good for my work truck. I just want the truck to be one color and the paint to last 2-3 years. I have read in a few areas about adding a hardner to bring out the shine and lay the paint better. Has anyone done this before. juts trying to find a low buck diy type of solution.
Valspar Tractor Implement High Gloss Enamel, International Harvester White, 1 gal. - 3449902 | Tractor Supply Company
Valspar Enamel Hardner, 8 fl. oz. - 3449669 | Tractor Supply Company

I shot my puller with the Tsc valspar restoration series enamel this winter. I used the hardner and it turned out great. I shot it ac Orange. Hope this helps

As long as you use hardner it will look decent and last. Ive painted many vehicals/race cars with it.

You can also use the dupli color paint shop paint from any auto parts store, they are ready to spray right out of the can. They have all sorts of colors, regular and candies etc. Look at duplicolors site for more info