I have been milling aluminum with misting WD40 as coolant, which has been working very well so far, but after dumping 3 gallons of WD into thin air (i know a lot of it goes with the swarf) within a year, I am noticing amounts of oil building up on other things in the shop (the mill is not enclosed, which is NOT an option)... so I am wanting to get away from mist coolant and goto flood cooling with partial enclosure ("splash shields"). I already have a coolant pump (the little $100 unit from mcmaster), and I am putting a tray (the 45Liter "low" containers they sell for under-bed storage) which is plastic, but seems to be pretty robust.
My question: should I run a coolant like Kool Mist 78 which they say can be used for flood cooling? Or is there a better coolant?
Any information will help.
Thanks-
Colin