Using the monofilament thread in your bobbin for many
projects is a good thing. When you use a color that matches the back of the quilt
in the bobbin and monofilament on top, the thread from the bobbin sometimes shows
through to the front of the quilt. This happens often when the machine quilting
stitches get shorter. If the color on the back is dark and the fabric in one area
on the top is light then that dark bobbin thread pops up a little and shows on to
the front of the quilt. The opposite happens if there is light thread on the back
and dark thread on the top and your top fabric is a light color.
If you have an older machine it may not "like" the monofilament
in the bobbin, so you will have to use regular thread.
Try using a "busy" fabric for the back of your quilt. It
helps hide the stitching, especially if you are changing colors of thread in the
Another tip: When filling the bobbin with monofilament hold
the end of the thread for a long time before cutting it off, other wise you might
get a rat's nest...Also if you have a plastic bobbin, do not fill it all the way
as the plastic heats up and won't come off the spindle till it cools. There is a
little stretch in the monofilament thread and may pull a little and some brands
of plastic bobbins may break.