Coolant for Gear Head Mill

[theGallery]

I have have been doing this hobby machinist thing for over 50 years but I have never used coolant. Even an old man should try something new at least once. I have a new PM45 gear head mill that came with a coolant system. I have a concern about water based coolant. Rust is not a friend of mine. I know it is probably in the head. The question. Could I us WD-40 as a coolant? The tank is small, maybe 6 quarts. I know it will be messy, but I would like to try it. Suggestions.

 

[Tony Wells]

Never run flammable materials in a sump system.