I have painted my paintball masks in the past, and the challenge is the fact that once you use flexible masks that the paint got some trouble staying on there. but for what i can see now does the brand Flexi paint, and Cospaint. work well on flexible paintball masks. but there have not been a lot of time passed since it's applied so it's hard to say how durable it will be over time. also this paint is mostly targeted for cosplay costume makers. so there are some more brands like it out there that should do a similar job. just look at it at a store that haves supplies for cosplay users.