Fryolux Solder Paint Grade D is an uniform mixture of finely powdered solder and zinc chloride activated flux, having a creamy consistency, for pre-tinning and solder coating. It has been especially formulated to keep the heavy solder powder in suspension and to reduce the settlement of the metal powder and therefore making it easier to restir and an aid to prolong its shelf life. If the metal powder does settle to the bottom of the container, then this is easily reconstituted with light stirring.