Go on Amazon and type in Frisket paper and make your selection
I have frisket in my inventory, and to be honest, I rarely use it. It's flimsy, easily torn or distorted and worst of all it's almost completely transparent, so sometimes you don't know if you wiped off half the mask before you paint (don't ask me how I know), but got dang it, it is reaallly thin, and occasionaly, for airbrush work that superfine thickness saves the day, but oh-so rarely.
These days I tend to err on the side of premask for vinyl cutting, as it's just a massive roll of masking tape. you can SEE when it's in place and it stays. If you find you're lifting your paint underneath you can heat it with a hairdryer to relax the adhesive.
Having recently done a ship this way I was having a terrible time with any of the parts covered in polyspan. It would lift EVERYTHING (dope and all) down to the polyester. Be warned!