I have some brass, nickel plated passenger cars that I'm trying to apply common waterslide decals to. Do I need to prep the car with a clear lacquer of some sort before applying the decal? I have attempted to apply decals to the raw surface and can't get them to stick completely. I can see silvering and some fogging of the decal film and no amount of decal setting solution fixes the problem. The techniques I use work fine on glossy, painted surfaces, but don't seem to work on raw nickel plated surfaces.
Ken