I think you're gonna open a can of worms with this one. Get a spray-mist set-up and be done with it. WD 40 is not a cutting fluid ( although it does work on some materials - mostly plastics I've found ). It's a lubricant with poor cooling properties. With a spray bottle you're gonne be standing there pumping the thing all day long, that's gonna get old real fast. For AL. a soluble oil should work fine, many available, inexpensive, google for mfr. Hope this helps.