I am doing a twin size quilt and my backing is sort of puckering. The quilt is larger than the table I have to work on so I laid the backing centered in the table with excess hanging down. I used large brown binder clips to hold the backing down and stretched it slightly. I then sprayed basted the backing and smoothed the batting onto the backing. Then I added the top and pined as much as I could that was on the table. Then it was time to move the "quilt" so I could pin the other areas. I unclipped the backing and moved the quilt. I clipped the backing that was not pinned to the table. Now my question- Do you have to pin/clip the sandwiched quilt all the way around to prevent puckering on the part you still have left to pin? Understand?