Proctologically Violated©® wrote:

However, a cupla people asserted that wd40 is the best tapping fluid for
aluminum they've ever used!

Kerosene is perhaps the most common cutting fluid for aluminum, and WD-40 being
largely kerosene, it ought to work. I buy my kerosene a gallon at a time, costs
a couple of bucks. Those spray cans of WD-40 cost what? Who cares? Why pay it?

GWE