Black 32 Oz - Liquid Latex Body Paint, Ammonia Free No Odor, Easy On and Off, Cosplay Makeup, Creates Professional Monster, Zombie Arts

Just look up liquid latex paint. Ahh shucks... here is the link. https://www.amazon.com/Ammonia-Liquid-Latex-Paint-Black/dp/B004XDMLAW Feel free to DM the results. I will bonk myself now.

I'd go with something like a skin safe latex body paint Not sure how well it'll last with sweat though, but it seems like it's purpose built so I'm sure the supplier thought of that.