Grafting waxes are used to cover graft unions to prevent them from drying out until the tissues unite. There are two types of waxes - hot or cold waxes.
Hot waxes must be heated to liquefy prior to application to the graft. They must be heated in a heating pot prior to use.
Cold waxes are liquid at room temperature because of solvents in the wax. They solidify after the solvent evaporates. In either case, the wax must adhere to the plant surfaces and be resistant to cracking and run off in rainy or hot weather.
Hot waxes require heating to keep the wax liquid. They are special combinations of waxes that have a low melting point.
Cold waxes contain a solvent that keeps the wax liquid until the solvent evaporates after application.
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