Use a refined Bee's Wax. A colored wax might transfer to your fabric.
Bee's Wax is used to coat the thread to strengthen it and prevent tangles when hand sewing. It is never used on Embroidery or Decorative thread.
Thread your needle and hold the thread snugly against the wax.
Pull the needle and thread through the wax to coat. It's that easy!
Miah helping me package my Bee's Wax.