Safe for all threads & fabrics, safe for all machines, does not melt or freeze, leaves no residue.
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This stuff works magic on thread for hand sewing! The thread glides through the fabric like butter. I attached one of the little pieces on my sewing machine, put the thread through it, and tried to sew. My machin did NOT like that at all. I will continue to use it for hand sewing but would ask other users to be cautious if trying to use it on their machine.