Quote Originally Posted by Bruno View Post
When I registered with the IRS I had to pick a category for my activities, which is officially 'Manufacturer of knives and hand tools', which is a subcategory of 'Metal working, with the exception of casting or mold injection'. Seems that if you want to do the latter as a job activity, that's a separate registration, possibly for environmental reasons (and permits etc).
Different regulators. Molten metal has it's own set of rules and laws for safety and environmental reasons.