I painted the front of my cab today, black.  I'm basically painting over what seems to be black (old) laminate, from an original Centipede cab.
Anyhow, I tried my best to follow tips from this forum, and spray painted in 2 passes, shaking can constantly, etc.  
The results I got are nothing short of horrendous!  I see shiny blotches and dark blotches all over the place.  it is not at all uniform across the surface... especially noticeable when light reflects off it --  and this is a semi-gloss paint I used, so light does reflect...
What can I do now about this?  Spray paint over it oncce more?  Any tips on how to do this right?  it is not a big area really... just the bottom of the cab, where the coin door is.
Oh, I'm using Rustoleoum Black Semi Gloss.  The same I used for the coin door.  I'll post a pic in a while.