A good quality gun oil is without doubt superior for the purpose of retarding rust.
But --- the smell of gun oil is totally incorrect for any keris.
I've used a mix of liquid parafin + synthetic sandalwood oil + natural kananga oil for about 40 years. I spray first with WD40, and let that dry off overnight, it leaves a slightly greasy deposit, then I apply the scented oil, and wrap the blade tightly in a plastic sleeve.
I live 25 meters from a salt water lake. I have never had even the smallest problem with rust.
The scented oils used in Jawa have coconut oil as a base and these do go rancid, leave an unpleasant smell and can build up a gunky residue. Brushing with mineral turpentine and drenching with WD40 will will clean this muck off without damage to the blade.
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