Thread Wax is used in hand sewing to protect threads from fraying, tangling, and breakage. Thread Wax is not necessary for all hand-sewing projects, but it is recommended for high-friction sewing applications like leather or canvas stitching, beading, attaching buttons, or sewing any coarse or dense material. Many sewers also use Thread Wax for embroidery or quilting to maintain the thread's smooth appearance.