Kroil penetrating oil works wonders on rusted and frozen metal and I think better than WD40.
Yes, but it stinks something fierce. Causes my sinuses to burn.
PB Blaster is better than Kroil - but the best is a 50/50 mix of acetone and automatic transmission fluid.
The most seasoned mechanics swear by both, but especially the latter..........
I used it to remove printer toner on carpet
Aerokroil is the best on rusted and seized items along with PB blaster, pretty hard core on the nose and skin.
WD40 is a great preservative and a fair penetrating oil.
Cheap to use on guns and wipes off to a tolerable coating.
I use Zepreserve for water displacement on ignition components. I am a mechanic. Will work for Ammo.
Any rusted bolt can be loosened in about 20 ninutes with a dab of Oil of Wintergreen.