Illustrative of its usefulness, it prevents gumming in aviation fuels. The same grinding machinery used for gumming is used for fitting. Carefully controlled heating rate avoids gumming as water evolves. Spindle oil is free from gumming properties. It was always Goebel who was gumming things up for State. Gumming prevents case hardening and fatigue cracking of the saw band gullets. Gumming involves grinding the gullets of the saw teeth to a particular shape.