What is Viscosity
Basically, viscosity is a measurement of thickness/thinness of a particular material. Peanut Butter has a very high viscosity rating while water has a very low viscosity. With this in consideration, oil will have a low viscosity and grease will have a medium to high viscosity. Most adhesives/glues will have a medium to high viscosity. When selecting the best tip to use, you must consider the general viscosity of the material. Generally, the larger diameter tips will work best for the higher viscosity greases and glues and the smaller tips will work best for the oils.