Bev, I'm crazy about batiks and haven't had any problems quilting them on the frame. That said, I can't imagine using a needle smaller than an 18, and I'm careful not to let the quilt get too high off the sewing machine bed.
I'm also discovering the pleasures of (shh!) poly thread. Some of the nicest newer threads are poly, but without that shiny, plastic-y look. The poly is much smoother than cotton, so less friction. And don't worry, it won't tear or hurt the cotton of the quilt.
Also, don't be afraid of the bigger holes left by the bigger needles. They close right up when you wash the quilt.
Hope this helps! END QUOTE
first of all i checked your webshots and boy! do i love that lattice quilt!
that said i have heard some very good things on blogs and tv shows concerning good quality poly threads, especially if the fabric has been pre-washed. no need to keep it a secret.
--Heidi
http://community.webshots.com/user/rabbit2b