I use a small (trim) HVLP sprayer and have 1/2 left over out of 1/2 pint basecoat. I'm not professional and know I spray less efficiently. Everything [MENTION=215048]02Giant[/MENTION] said is excellent information and right to the point. For one frame cost adds up fast. Primer/sealer reducer & clear will come in larger sizes minimum. So if you are doing several over time all you need to buy is a 1/2 pint of basecoat to change color if you stay with the same system. I'm assuming you are using an auto base/clear system with the proper primer, activators & hardener.
If you don't already know the process I'd suggest going to a local auto paint supply and talk to them rather than trying to figure out all the products you need on that website. Most trade auto paint supply houses deal with hobbyists as well as professionals, and are very helpful. Just try not to pass out when you pull out the credit card. It will look great!