I'm using wool batting and if I remember correctly I can have 5" spaces but there won't be that big of a gap anywhere in the quilt. At the most 3" gap. Thanks for all the comments.
great idea...never thought to use black thread in this way...I am working on a stained glass quilt and may not change threads (black for sashing) and just quilt the rest of stitch in the ditch in black.
