For coolant, I use kerosene for most everything. It's what I have in the tank because I do a lot of aluminum. I have a fogless spray mist type coolant system that I built. I normally apply the coolant at about 1/2 cup per hour. At that application rate, it just evaporates so no mess. I don't like the water based coolants for the work I do. Cutting oil from the local hardware store works also, will work in some spray mist systems if thinned with kerosene. For really light work and engraving I use soy oil (cooking oil) applied with a brush or oil can. Apply enough air to blow out the chips so they are not being recut and jamming up the end mill.
I use a lot of A36 just because I have a lot of it kicking around. I'm sure it will work fine in place of the 1018.