Yep, I gave a fresh coat of silver to the plastic components...end/vestibule moldings, dome, observation end roof/door...of a set of 2500 (aluminum) passenger cars for a friend. On the dome I used the liquid mask...Micro Mask, by Microscale, the decal folks...which is generically the same as the brand(s) mentioned earlier.
I used Tamiya Silver Leaf (rattlecan) for the paint....EXCELLENT coverage/spray pattern/color match....IMHO, of course. The thing to remember about the liquid maskers is that you CANNOT use acrylic (water-based) paints with them...they will lose their 'maskiness', if you will. i.e., water will dissolve the mask...even after it dries.
Yeah, it was a bit tedious carefully painting each pane of the dome with the masking fluid. But it was totally worth it! It came out B-E-A-U-T-I-F-U-L!! And, BTW, you probably know this anyway, but you don't paint the inside of the dome!!...in fact you might want to mask this with several pieces of tape just to ensure that overspray doesn't reach the inside surface. I did.
So, FWIW.....
KD