How do YOU protect your transmission case from corrosion?, What coatings do you use? Options

[Dr Evil]

I am trying to finish my notes to accompany the rebuild video (notes will be free) and I am wanting to pick your collective brains for info on corrosion prevention for the mag alloy case. What do you do? The factory coating only lasted a few years and is long gone now. On most peoples cases, it is the oil that keeps it from corroding (IMG:style_emoticons/default/wink.gif)

[Katmanken]

From my mag casting days, the magnesium institute book recommends zinch chromate paint. The zinc acts as a sacrificial anode to prevent corrosion, and the binder in the paint seals and protects. Comes in green and bright yellow.

My tranny has a thin coat of aircraft grade zinc chromate paint on it, and a thin coat of wheel silver.

My second choice would be the tan tectyl like wax coating suggested by the factory. Some of those coatings have corrosion protectants formulated within.

For those of you that passionately believe that paint prevents appropriate cooling, you might research the heat transfer rate through the factory recommended tectyl like coating, or the heat transfer rate through the usual coat of grease, oil, and crud.

Bottom line, uncoated it rusts, and appropriately coated, it won't.