Hi Mac.....thanks for the heads up on that stuff.....one thing's for sure, we didn't have a rust problem or any problem related......I'm going to check with our local supplier to see what they have......at any rate I'll only need a small amount as I'll be using it in a mist cooling application.....a litre at 20:1 dilution rate would last me forever.

Some time ago I did some repair work for a guy who had an iron mongery business and one thing he had was a small centrifuge......he stocked them and sold them all over the World for small time milk processing in Africa and India etc.

In the course of discussing it's merits from separating cream from milk etc, he also said you can emulsify oil and water to make a mix for some purpose........now that is quite interesting as oil and water is a coolant and it doesn't need something to chemically break down the oil to make it emulsify......I'll have to investigate that process as it was 30 years ago I last came across it.
Ian.