I do contract glazing, have literally cut miles of aluminum for the last 37 years. We buy WD-40 by the gallon and use it in cheap plastic spray bottles. Start your blade running and sparingly squirt some on the spinning blade. When I started, a long, long, time ago we used wax sticks and Craftsman crosscut carbide blades. Now I buy Amana Blue aluminum/plastic blades and unless I'm cutting 3/8" or more I don't even bother with the WD-40. You can really use any high tooth count carbide blade, but negative tooth rake is the best...the aluminum/plastic blades have a higher rake angle than even the melamine blades.