I like a mixture of linseed oil and melted wax (Gulf wax for home canning), and a bit of turpintine. I melt the wax in a big pot, on a camp stove, then mix in the linseed oil and turpintine, while it is still melted. You can make it as stiff and waxy as you want, by reducing the ratio of liquids to the wax. It will thicken somewhat, when it cools.

I have used this method to treat metal food cans for wet storage on long sea voyages, and it works very well. Cans do not rust, even when stored in the bilge of a boat!!! Bees wax is even better, but it is kind of expensive, so I usually use Gulf wax. I keep a jar of it in my shop all the time, to slush parts with, before shelving them.

Also good to slush down inside doors and underbodys.

Another good thing is thinned down Stockholm Tar (sold at horse tack shops, for hoof treatment). Thin it with mineral sprits, and use it as a brush on, or a dip. It is very messy, but protects like crazy. Great on underbody parts, as it is a brownish black color, so it looks like undercoating!

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1973 Mercedes 280 "Strich Acht Dunkle Rot"