it depends on the effect u want if u want a simple smooth painjob paint it from the inside but if u want a complicated paintjob with a lot of detail mask off the windsheild and the light n then paint it. i would suggest an airbrush but if u cant get one use a spray paint can.
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my cars:
mazda rx-7-duel cell-lowered-dubs
skyline gt-r
supra
celica
lancer