Man I think your hosed if it anything like most die cast companies ive seen. The maintenence guy will usually gerry-rig things to work and the heat and dust will muck most stuff up.
The diecaster I was in the same building with allways used this one type of spray and would load the stuff up in a weed killer type spray bottle (big tank with hose). These guys would use so much of this stuff they had to suck it off the floor after the shift change.
You didn't say what material they are casting. These guys were using a graphit spray in brass (makes an unholy mess) and a teflon release agent in aluminum and zinc.
I think if their employees cant remember something as basic as spraying the mold then they should maybe find some different guys. Thats almost as bad as forgeting to tighten the vise on a mill.
Personaly I would not touch a job like your sugesting. Because of the dirt and heat I think your going to have gumming up problems and or boiling problems (if the nosels are to close).
You will be marrying this one.
Good luck
thanks
Michael T.
"If you don't stand for something, chances are, you'll fall for anything!"