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I found the info on a sword forum and elsewhere.
I believe I posted the more specific properties of it on another thread I started regarding Heat Treat Procedure on this sub forum.
The original white formula Milk of Magnesia is Magnesium Hydroxide (MgOH2) which is Magnesium Oxide combined with water.
When it is heated over 660F it releases what water is left (after drying on blade first) and decomposes to Magnesium Oxide (MgO).
Magnesium Oxide (MgO) is a good refractory with a melting point of over 5kF degrees.
I will eventually be trying it. I intend to apply 2-3 thin coats to diminish cracking, letting each coat dry.
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