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asad137 t1_iu58duo wrote

Reply to comment by Tallguy67ca in How can I remove a headless screw from a shower valve? by foootrest

It's both. It's not particularly great at either, though. There are better penetrating oils and better lubricants.

Also it's kind of amusing to see "WD-40 is a lubricant", since in lots of discussions regarding WD-40 people make the (also erroneous) claim that WD-40 is a solvent, not a lubricant.

WD-40 is a mixture of solvents and lubricants. The solvents thin the oils and help it penetrate, and when the solvents evaporate what's left is the oils.

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