Experiment

This raider, like many others, is painted like this because I had an extra gun with only a base coat laying around, extra paint and a LOT of time.   I spent only 10 minutes or so taping up the raider the first time (I taped all the parts I wanted to stay black) and then did a gold coat over it.   When I took the tape off, my heart sunk.   I hadn't spent enough time making the tape perfect, so that the gold wouldn't get on parts I didn't want it.  I spent a while repainting the gun black.  Then spent a good hour making sure the tape was perfect. I did the gold coat again, and took the tape off, yet again, the gold had gotten on parts I didn't want it. No less then 2 tries later (and a lot of tape) I got it how I wanted it.