I painted my M30 rocker cover with some VHT wrinkle paint.
It has a nice textured finish though if i were to do it again i'd use only 2-3 coats rather than the 4-5 coats i did on mine to give a better finish.
I used brake cleaner and some paint stripper to remove all traces of that yellow cosmoline stuf.
I used no primer.The VHT paint is easy to aply with no runs even though i was putting it on thickley.
The only down side to this paint is it takes at least 48 hours to cure,but this might be speeded up with some heat.
Please excuse my engine bay as it is a mess and the intake/air filter is going to be changed soon !
http://img44.exs.cx/img44/5482/picture001a0nb.jpg
http://img135.exs.cx/img135/7877/picture003a3yf.jpg
HTH
Andy