a) WD-40 is 100% volatile - over time. Please look at the MSDS if you have any doubts.
b) The sticky -slimy skunge left behind when it is (under) used is the old hardened lubricant that has now been evenly distributed throughout whatever was sprayed.


https://files.wd40.com/pdf/sds/mup/w...sds-us-ghs.pdf


Peter Wieck
Melrose Park, PA