For some reason Ford was using red OEM on the driveshafts and half shafts some years ago like the late 90's early 2000's.
These used the 12mm head 12 point bolts. I asked the driveshaft service that did the balancing and they said yep just a drop of red, don't cover the whole bolt threads with it.
I don't know the reason, may be they work loose who knows. I never used it before on these kinds of bolts.