If you're using a spray enamel, it won't stick too well to a lacquer base/primer. It will tend to fish-eye a LOT!
Also, any oil/grease/silicon on the surface will cause that. Even the natural oils in your fingers, or if you wipe them down with a rag that has had any contact with spray lubes and such.
I'd suggest stripping the lacquer primer off, and starting over, and just use the enamel on bare steel wheel.

All I did when I painted mine was clean them really well(I have a HUGE parts washer...sorta like a big ol' dishwasher), scuff them with Scotch-Brite, and squirt the color on them. Worked out really well. That was prolly 10 years ago now...they still look just as nice as they did then...

After talking with the fellow about powder coating and bead blasting the rims I thought I would fill the rest of you in. (I sent Bob a PM on this the other day) Cost is pretty expensive for the powder. This would be true in small shops like his that do basic colors. He had a silver but couldn't say it would be a match without looking. He figured that enough powder to do the 4 rims to cost about $115.00 Bead blasting was no problem. Shooting the powder on the rims may have some problems with shadowing using silver paint. He thought the conture might be some problem to get an even flow with the silver. All said and done you would have above a couple of hundred in them.
Then there is the thickness issue that Joel brings up. I am not sure this would pose a problem in any mounting aspects but I can certainly see the area around the lug nuts cracking out.

After review I would hate to reccomend this until somebody tries this and sees if it will work. When I had the original wheels on the Stingray I went to the NAPA store and had the mix me up 2 cans of spray bomb Argent Silver. 7 years ago this cost $15.00 a can but it was a correct match and was a Dupont paint. I lightly sanded down the rims, shot primer on them, lightly sanded them again, and shot on the paint. They looked fine. They still look good today running around on a friend of mines S15 4wd truck. He touches them up every once in a while with the remaining spray bomb. Tuxblacray2008-01-26 06:49:56