If it were me doing this paint scheme, I would follow Steven's advice. The difference being for me is that I would paint the red, mask it then paint the silver. The problems I have had with some silvers is that the masking tape would pull some of the pigment off. It would not pull an entire layer of paint like some of us are accustomed to, but would pull off perhaps a little bit of the paint here and there leaving a silver painted area, but it was very splotchy.