For decades WD40 was seen s a 'toolkit in a can'. There can't be many households who don't have at least one can, but you won't fin many in the motor trade where time is money using it as a release agent. Plus Gas is pretty standard.
WD40 does lots of things, some reasonably well, but they're not uses for which it was originally intended. As is commonly known, WD 40 stands for 'water displacement' and was the 40th recipe they tried when developing it. It has a fairly high surface tension, which is the opposite of what a releasing agent needs to be. That's why, some years ago now, WD40 (the company) developed its 'Specialist' range of nine products, one of which is a penetrant rather like Plus Gas, as has been mentioned in other posts.
WD40's own statement about their 'Fast Release Penetrant', is an admission in itself that the ordinary WD40 isn't up to the task:
Quote:
Our Specialist Fast Release Penetrant spray specifically targets corroded or rusted components and mechanisms. Its formula loosens stuck or seized parts quickly and easily. The penetrant has an extremely low surface tension, meaning it can cut through rust, seams and tightly-bonded threads to easily saturate and lubricate seized fixings. The Smart Straw and 360° valve allows it to be used precisely at all angles, and the capillary action of the formula means it can reach tight and hard to reach spaces. Highly water resistant, Fast Release Penetrant can also displace moisture that may be disrupting smooth movement, and can be used as a preventative to prohibit the build up of rust and corrosion in the future.
Unquote.
This is the penetrant:
Penetrant Spray
This is the full 'specialist range' (Nine products):
WD-40 Specialist Archives
This is the 'motorbike range' (Six products):
WD-40 Specialist Archives
This is the 'bike range' (Two products):
WD-40 Specialist MOTORBIKE Archives
Make of it what you will - I have no connection with WD40 ,and apart from the original WD40, I haven't tried any of their other products - I've used Plus Gas since 1960 ad don't see a reason to change.