No I don’t, but if I was using a long piece, say a yard or more, I think I would. I use 12-15 inches usually, so don’t pre shrink it. I also pull out the cording a seam allowance (after it is sewed in place) and cut off, so it isn’t caught in any seam. If it should shrink…wouldn’t pucker anything. Did I really confuse you now? Betty