I enjoy the handwork of wool applique, so I'm not sure I would ever use the machine for this work. Since I often use 50 & 40 weight thread for hand applique using wools and it doesn't show, I would think it would be similar if using the machine. Sewingpup, I would love to see one of your projects. Perhaps, it would convince me machine applique my wools. Oh and can I ask what size needle you use when using 12 or 28 weight? Thanks.