I bought a high quality horror mask for my job at a certain Halloween attraction this season and I love the mask but it has a sort of shiny glaze to it. I'm looking to either remove or fix the shine of the mask so that it is "un-glazed" and matte black (already black so i just need to remove the shine).
A shiny mask will hurt in a few ways. 1. light may reflect off of the mask when video crews come through as well as when guests take photos and 2. there are lights in my area that will give me away if my mask picks up the light in the wrong way.

My friend is into film and says they use bug spray to take the sheen off of things in order to diffuse the light, but doesnt know how long it lasts.

If anyone has any ideas please let me know.