I no longer pin bast. I think I would try the method of hanging the backing and using 505 spray basting. I don't know how you could do that on the boat (don't want to get sticky overspray)but the RV outside is one large canvas. I would protect the RV with a sheet or tarp fastened to the top rack. Patsy Thompson shows how to spray bast a quilt on the wall and you could watch that for ideas.
Last edited by Tartan; 06-18-2013 at 05:08 AM.