A professional who tends mixing machine to prepare materials used in insulation jackets of rocket-engine chambers, and repairs defective jackets. Respnsibilities include:

• Weighs out and pours specified quantities of chemical ingredients into mixing chamber of colloid mill.
• Starts mill and moves controls to set automatic timer and maintain specified temperature of mixture.
• Opens valves to transfer mixed ingredients from mill to storage tanks.
• Examines and feels insulation jackets for defects, such as breaks and surface flaws.
• Removes defects, using power grinder, and fills recesses with specified insulation material, using spatula or spray gun.
• Buffs repaired area, using power buffer.