ok... layered all the way... so I was lookin' for an all out silver coat, make en mask scratches... give it a dark grey layer, mask scratches around the allready masked silver scratches... then the top colour... scratch off the masked dark grey and silver areas and tada
so this is over my head I gues...
well whatever you do it looks fantastic!! 
wish I had acces to air brush etc... I HAVE to do topical... or nothing at all 
keep going, this looks amazing!!