Mehron Makeup Foundation Greasepaint | Stage, Face Paint, Body Paint, Halloween Makeup 1.25 oz (38 g) (BLUE)

I'm looking for something to use to blackout my eyes in Batman masks/cowls. I don't want something that's too difficult to get off. Will it work?

Can I use this product to color my beard and mustache for a historical production? I need to make it gray/white.

Does this wash easily with water? Makeup remover?

Is this rmg? able to apply this on elf ears by any chance? please let me know, thank you!