^^ Spot on...Use "Rustoleum Truck Bed Coating". Its about $8 a can, and well worth it. Just make sure you rough up the surface before painting. Also, some guys have used self etching primer with good results
If you're leaving the tires on the wheels, invest in some note cards. Jam the note cards between the bead and the tire. On a set of Jeep wheels, we used this set up with great results. Note cards and blue painters tape were essential to get the full wheel.For those that have done this... Did you leave the tires on the rim? Does the burger pop out of the center cap?