I've had good luck with Duplicolor rattle can primer, then Duplicolor rattle can white paint, then Duplicolor rattle can clear coat. 15 year old saturn painted that way has not yellowed.

Duplicolor rattle cans are meant to match paint used by car manufacturer's. If duplicolor white/clearcoat rattle cans yellowed, there would be upset people presumably.

Duplicolor rattle can prices have inflated sky high (at least where i live). 15-18 dollars for 8oz can (autozone, advanced auto parts), vs 7 dollars for 12oz can of Rustoleum Painters Touch 2x (home depot).

Bob