I have recently learned about using the 60wt bobbin thread.
All cotton.
I had just been using prewound bobbins which are 40wt, until mentioned using the 60wt for paper piecing.
I am now hooked on 50-60wt in the bobbin for ALL of my piecing as it really makes the seams lie flat.
It also FILLS a good bobbin since it is thinner, it puts more on the bobbin which means fewer bobbin changes, and time saved! YEAH!
Wondering what othesr use in the bobbin and if you love 60wt as well.
I have found that it is not easy to find, and the color selection is lame...but I really do love it!