I will sometimes piece leftover sections of
quilt batting to make a larger batting. Some quilters piece batting by
butting straight edges of the batting together then
whip stitching. However I worry that the batting 'splice' might
fall on a logical fold line for the quilt and folding over, and
over might cause weakness in the splice. Therefore I splice my
batting sections on a wavy line. This also makes the splicing
line less visible.
Overlap the sections of batting by about three
inches. Using scissors or a rotary cutter, cut a wavy line
across the overlapped area. Remove excess cut-away batting from
both top and bottom batting pieces.
Then use a whipstitch to hold the two sections
together. I like to stitch double lines of crossing stitches to
make sure the batting pieces stay in place (see below).