Caulk machine castings.
What does a Machine Castings Plasterer do?
Caulks machine castings, using putty knife or trowel: Measures out required amount of metallic plaster, and mixes it into paste of specified consistency. Applies paste to surface of machine castings, filling cracks and blowholes and leveling rough spots, using putty knife or small trowel. Allows putty to dry and sands plaster to smooth surface.