I'm shopping around for some new end mills both standard and ball. I'm confused what these different coatings do and whether or not they can be used with coolant. TiCN and TiALN are the two that I'm looking at as I cut mostly aluminum. I read somewhere that TiALN is suitable for dry milling and the heat actually makes the coating perform at its best. Does this mean I can't use coolant? I'm just looking for long lasting/tough cutters. I have a X3 so I'm wondering what I should go with. I plan on using a fog busters coolant system.