I removed the paper after the top was pieced - yes it was a pain to remove all the little pieces between seams.
I have purchased Ricky Tims Poly Stable Stuff for paper piecing for a project about 3 down the list, you leave it on and when washed, it turns to fibers. I have handled a PP quilt this was used in, before & after it was washed...I think I'm going to love using this!