When I painted my Trek 400 I used rattle can charcoal metallic. Not sure if it's the same situation but in certain spots the paint seemed more like the texture of a pile of arts&crafts glitter sprinkled over glue (if you remember that project). I think some of the problem was the funky angle I had to turn the can to get at places like the BB shell cluster. Someone also told me that with metallics you should heat the can gently in sub-boiling warm water and then shake the hell out of it for a couple minutes before you spray.