peasant wrote:My main gripe with waxoyl is that it consists mainly of wax. This will harden over time and crack, at which time moisture can creep in under it and actually corrode the metal worse than if it wasn't waxed
...or so the theoretical "wisdom" of several competitors goes.
Grease on the other hand is supposed to be permantly elastic, non-hardening and forever creeping ever deeper into the tiniest cavieties, especially in hot weather.
For underbody protection something like waxoyl is probably better, as it is harder, more impact resistant and less sticky. But inside cavities and box sections grease is supposed to be yer only man.
Also you can get at the underbody readily enough to repair any worn sections ...inside a box section is somewhat more difficult

Back in the 70's a typical underbody protective treatment would be Holt's Undershield a thick, black, rubberised, gooey substance that would eventually dry & crack & possibly trap moisture behind it.
Then along came Finnegan's Waxoyl, a wax anti-rust treatmant that could be used sprayed into cavities or used under wheel arches & on floorpans etc. Waxoyl is water repellent & if scratched knits back together to form an unbroken covering layer.

Sorry Peasant, your argument doesn't hold water & neither does Waxoyl!
At some point Hammerite Products took over Finnegans & introduced Hammerite paint of various types & colours. Hammerite Underbody Seal is a current product combining Waxoyl with bitumous/rubberised type compounds for easier application. I have a tin of this product in the kitchen & I compared it to the advert on the link provided by Blackdog & I am puzzled by the word ''schutz'' as it does not appear on the tin & I don't speak German.
So, just to recap:-
1) Hammerite/Finnegan's is all one company.
2) Waxoyl is an anti-rust treatment for vehicles etc.
3) Waxoil is a furniture treatment!
