I like using the Invisafil thread for machine applique. I use the color of the applique not the color of the background. I also use it for stitching anywhere I might use a finer thread like when hand sewing the binding. It now comes in 60 colors, as well, so can match just about anything. I don't usually use it in the bobbin, but when I do, I make sure I wind the bobbin on a slow speed.