I have a used driveshaft that is nice and straight, and in good condition at both ends. But the rough "shank" area between the two finished ends had some surface rust. So I sand blasted the rusted area (protected both ends).
Now I have a nice, clean driveshaft that's not ready to go into the car quite yet. Ready to start rusting all over again if I don't protect it.
What is the best practice to protect the shaft from rust? I'm assuming that it will stay well oily once installed, but in the meantime do people just spray them with something like LPS-3 or do they prime them with some sort of paint product ?
Rub on a little grease, that should do it.
If you're worried about a mess with the grease, or the grease picking up dirt and dust over time, just wrap the greased driveshaft with plastic wrap. The plastic wrap will stick to the grease.
I spray the center section with Electrical varnish. It will last forever.
Just because you have it on hand I think - yes LPS 3 will work fine too. I spray it on a lot of things that I don't want to rust anytime soon. If small I put the part then in a plastic bag but you could wrap the shaft in wax paper or any kind of freezer paper that has a waxy side to it. That will keep it from getting grease onto things. Once in the car the motor oil leaking past the top bushing will keep it from rusting. Most model T stuff survives to this day BECAUSE of the oil leaks ha ha.