Well, I'm still very little the wiser. There is this disclaimer at the bottom of the page etaoin linked to:

The uses of WD-40 described on this Web site were provided to WD-40 Company by end-users of the product, and do not constitute recommendations or suggestions for use of WD-40 by WD-40 Company. These uses, including the "Use of the Day", have not been tested by WD-40 Company. Consumers should exercise common sense whenever using WD-40. Always follow the instructions and take heed of any warnings printed on the WD-40 packaging.

So, as far as I can make out they are selling this product which various people have used for outdoor penetrating and lubricating, for which it may or may not be suitable, but the company is not going to tell us what the product is supposed to be used for.

Bingley

Bingley