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I always use paraffin as a cutting fluid for aluminium.
As far as I know, it is the preferred cutting fluid for aluminium throughout the engineering industry.
WD40 may work ok though .. I've never tried it myself .. but paraffin applied by brush is a lot cheaper than aerosol wd40 and may solve your problem.
I've drilled many holes of 1mm or less without problems using paraffin, but without it the ally swarf tends to "weld" itself to the drill bit.
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