There's another form of vacuum metalization
I jumped into this as I thought it might be about the sort of vacuum deposition I know about and use. In a high vacuum, you can use tungsten wire to evaporate, say aluminum, which will stick to just about anything. It acts pretty much like light rays (they go out in all directions, fade as square law), only these are aluminum. If done properly, the part is coated very quickly and with little heating. The process is used for telescope mirrors and other cool optics, for example.
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