I'm making a mini cape out of flexible vinyl, like the kind used for window clings. I need to leave light blue, permanent marks on the vinyl that won't peel or flake as the cape is flexed.
I'd really prefer a pen or marker of some kind, because I need to make designs that I am not confident I can do with a brush. The designs also need to be quite fine, like 2-3 mm max.
Is there a single type product that would work? Or would I need to use multiple products (application + sealant?). I have no idea what will actually adhere to the vinyl without smearing.
Here's a prototype of what I'm working on, for context:
As an added bonus, I've found out that the material grabs my finger prints very easily, so preferably the solution will hold up to being wiped down periodically to remove prints.