I don't know if it would work for PP, but I recently used tracing paper for a design to stitch on a quilt. I sprayed a piece of printer paper lightly with 505 and carefully placed the tracing paper on it. I was able to run it through the laser printer to get my design.
I did this because I wanted to stitch through the paper onto the quilt edge. It is just a small candlemat that I wanted to put a few hearts along each edge.
Considering that I can do this and tear it off easily, perhaps you can use it for paper piecing? Just a thought.
uote=inemmausinn]I'm about to start a huge paper piecing project and have been doing some research. Vellum is a great tool. So were do I get it. Scrapbooking uses thick vellum and I need thin. Do I go to the quilt store, craft store or office supply?[/quote]