Presidential Unisol 601 Metalworking - Heavy Duty & Water Soluble Machining Coolant for Drilling, Tapping, Sawing, Stamping, Threading - Non-Chlorinated - Made in USA - (5 gal)

works very well against corrosion even with hard water

The description in the ad, as well as the label on the 5-gallon pail states that this is a "water soluble" coolant. However, when added to water, this yellow-colored oil simply floats on top of the water and will not mix. After sitting for over a day, the oil is still afloat. The product I received is not water-soluble by any means and I could not use it. Was returned for a refund.

I'm playing with the concentration on this hopefully to reduce the foam. It's at about 3% on the brix scale right now. It works but not sure if I can deal with the foam. It causes the chip catch to overflow and eventually leaks on the floor. Hopefully they find a way to fix that. I have 2 other machines I'd like to put it in but I can't because of this issue.

Does exactly how it should work. Mixes really well with water.