If you are trying to do curved piecing by doing paper piecing, I don't know if it can be done. Can you post some pics so we can see what you are trying to do.
Basic curved piecing is easy to do and doesn't really need any stabilizing paper.
If you are sewing a PP curved part of a block and adding the outside and inside background, you would remove the paper before adding the finishing pieces. Here is an example of what I am working on now. Is it similar to what you are trying? The ring of scraps is PP. Then I remove the paper and sew the outside and inside curves to it. Hope this helps.
peace
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