Ditto on the Used motor oil
Works great and last for years if you get is deep penetration into the surface... but the process is sinky and smoky.
Heat no... warm the piece or section if its large and either dip, pour or use a old rag to wipe on the oil.
Watch yur heat.. the oil should smoke and bubble but not burst into flame... of course be ready for it to do so at any time... but that just adds to the fun of it LOL
If an area.. like on sheet metal, is not even, reheat that area and a lil larger re apply oil.... this heat will may be enough to spread the existing oil better. If not be ready to add a lil oil to feather out to the surrounding area.
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