Coolant, I am not sure which one to go with.

[JAZZCNC]

It is a bit confusing that you have to ask. To use suds you usually have a tank, pump, flow control, pointable nozzle, splash guards, return hoses and filter. If you have all that then you might be expected to know what to do with it.

Robin Can't say that because althought the Lady may have all the gear and know how it works or been shown it doesn't follow she knows what to put into it.? To me that's exactly what she's asking WHAT COOLANT DO I USE.!!. . . Not How do I use it.!

Suesi Like M_C says any of those will work for general cutting but the synthetic may be best in your case to avoid Mould, smell etc.