100% pure craft grade Beeswax Thread Conditioner. Lightly hold thread over top of beeswax and gently pull across. This will provide a weightless coating to the floss allowing the thread to glide smoothly through the material. Beeswax will also help to prevent fraying especially when using metallics. After coating thread lightly pull the length through your fingers to remove any excess wax. Beeswax should not be visible on floss. Only a very light coating is needed.
Beeswax is naturally occurring and will wash out with warm water.