Hi joemod, and welcome to the forums. 
The yellow painting challenge has come around several times in the past. You can use the "Search Our Community" box to the right with a few key words like "yellow primer airbrush" etc. Here is one to get you started: /forums/p/4908/36892.aspx#36892
Had to do the same research myself recently in preparation for painting my first "yellow wings" plane, a P-26 Peashooter. Plenty of good suggestions out there.
Good luck!