I don't know about "mirror finish". It's just rattle can Duplicolor "metallic silver".
I want to put Future on the area that would be covered by the masking tape,
not the area that would get the second color (Duplicolor metallic gold). I was
just hoping that the Future would stop the tape from lifting some of the silver
and graying it.
In General Mike:
Metallic rattlecan paints are very different than Metal Flake colors. The tiny platelettes float to the surface to form a sort of shiney surface. anything you put on it including your fingers removes a little of this "shine". To date after extensive testing of all sorts of paints and coatings including future NONE have been able to keep the undlaying shiney surface from going completely grey on contact.
I have a basement full of samples from all kinds of manufacturers rattle cans without a single one that can be clear coated at all other then Alsa Corps. Killer Chrome system that we can't really afford. gold, copper, Brass, and bronze Metallics all do pretty much the same thing.
Best advice I can give is to go with Metal flake colors rather then staight metallics. Rustoleum has several that seem to work just fine I don't have the specific names at the moment but they never involve the term chrome or mirror finish.
Heres a picture of a model I painted a long time ago but still can't touch or the finish will be gone. and my Deep Space Transport that was Krylon Silver metallic until it was clear coated...becoming instantly grey.
