Kinda the procedure you've mentioned afk, but i've used a matt black paint and the look is quite as the tank's colour but not satinized... I'm sorry but I am not familiar with the painting terms to be honest ... like one special undercoat for plastic paint preservation that prevents the paint cracking....

To tell you the truth I'm not that satisfied but I never am anyway cause the type of colour doesn't need as much detail but if you are really planning for something special... hmmmm

when I finish I'll post a link of the beast

Sun is shinnin, beers are calling...