I spray painted as well, but used a satin so that it could be handled easier with my hands - think it was Krylon Satin Black or something. My painting is flat black - can't tell the paint difference in the cans.
You have to lightly spray on the inside, rotate it, then continue spraying. Let it dry, then do another coat. The rings on the other hand, due to the plastic nature, didn't take paint as well as I had hoped. The paint didn't end up 100% even on the rings, but was fine as no one could really ever notice (especially with the lights on).