Beeswax will strengthen your thread and help to reduce knotting in hand sewing. Simply place the thread on the edge of the block and draw it back and forth several times to coat the thread. This coating will stabilize the thread.
Beeswax has many uses. Try it for lubricating zippers and smoothing the surface of your iron. It is also useful for easing the tracks in sticky drawers and windows.
Use this block alone or use it in a plastic holder to protect it and keep it clean.