‘Hot Spray’ kettles were probably used in the Boston Bombings?
Sounds like it by the description of the ‘pots’. General Motors would have had hundreds of them. It was a system used only for a short period during the early 1970’s. Never was any good. Required at least two pots for painting. One heating while the other was in use. Screwed to the spray gun. Museum pieces now. Though they may still be used by ship builders?