I Also Own a Mustang and on A Forum or Two...

I don't know what yall use for a rust preventative, but I've seen WD40 used in that thread on the Ford forum. My advice is to stay away from chemicals similar to WD40, as it is not a lubricant. It's a water displacer. It will evaporate quickly and once gone, whatever it was on will rust quickly. If yall want something that's both very professional and WORKS try a product called Fluid Film. That's what it's made for. It looks like this. The stuff flat out WORKS.

FLUID FILM.png