the front curtain has a wide variety of names like the house curtain, act curtain, grand drape, main drape, and main curtain. but this curtain is most popularly called a proscenium curtain and is used to put a barrier between the audience and stage, usually right before or after a show/performance.
This is only an idea, but an advantage could be that you don't have to wait for it to dry and disadvantages could be that you don't get as vivid colours?
