Hi all. I have painted metal minis in the past but never plastic. I have a whole box of Reaper paint (water based) and was wondering if it would work on the plastic minis well. The paint that comes on them looks oil based to me. For instance on the Dragon Knight in Heart of Cormyr, if I wanted to repaint his sword silver. Could I paint the reaper paint right over the gold? How about areas where bare plastic is showing, should I prime and if so do I need special primer? Any thoughts would be appreciated.