I'm not sure about the Domino, but for plunge router posts I use either Boeshield T9, or Renaissance wax.
Boeshield T9 was formulated for the aircraft industry as a "dry lubricant and corrosion inhibitor. It gets applied as a thin liquid, and then dries out as a wax film. The surface sort of feels like a harder sticky wax. Bicycle shops routinely have it.
Renaissance wax Is a microcrystaline paste wax that is used to protect the surfaces of metal and other items in museums. The Renaissance wax needs to be applied and then wiped off, but it dries to a harder, smoother surface, than the Boeshield T9. After I started applying Renaissance wax to my router plunge rods, the routers plunged much smoother and easier. Personnally this is what I would recommend, or apply the Renaissance wax over a coating of Boeshield T9 since the boeshield seems better able to get into microcrevices in the surface to prevent corrosion. Just make sure you wipe the surfaces well after coating them, since both products can leave a thick wax coating.