Small Scale Military Headquarters

I have been dyeing some of my customs but find that the dye rubs off quite easily. Is there some way to seal the new color on the plastic?

Not that I'm aware of... Dyes, depending on what you're using, tend to bleed even on fabric. On plastic you need something to chemically bond with it rather than "dye" it per se. I've seen someone use optics tinting to dye things, but that's as far as I've ever seen that worked, and that process is expensive if you basically aren't an optometrist I think.

have you considered paint?