We have a hot glue machine at work that would be just the thing for you. It has adjustable temp pot, a pneumatic over hydraulic pump, heated hoses and a heated, air solenoid valve controlled discharge gun. I cannot for the life of me remember the name of the manufacturer, but I can get it Monday if it will help. I'm sure they sell seperate parts as well as complete systems. The name is something like Nordstrom. You migh try Google for hot glue equipment. It's a very well built, and trouble free system, and it runs your temps easily. When you're done with it, you just let the stuff harden up in it, then when needed again, just reheat.