V. Jill, I have always used CC thread because it was easily obtained, and because they have been in business for years. But that cotton machine quilting thread leaves something to be desired for me. My machine just does not like it. I was trying to do this project kind of by the book. Cotton fabric, cotton thread, but it simply did not work. Live and learn. I suppose. I did research during the turmoil, that there are quite a few quilters here who use the all purpose, so I think I should be OK.