You used to always have to set Matalic Spots to Overprint because they used to always be Opaque, but these days, not so much...I still do though just out of habit
It's also important to let your printer know what is going to be printed in metallic and what colour you want it. You can have any spot colour set and call it Blue Metallic or something, but the printer may not know that you actually want a metallic colour. It's important to specify this as any colour on any plate can be coated with any ink. Metallic Inks are used at the printing press stage. So there is no need to have any special effect, you could just have black text on a white background and they could print that with a metallic ink. It's important to realise that this is outside of the CMYK gamut and it will be a 5th colour, adding costs to the print run, extra plates cost money.
The other reason to specify it to your printer is that the printers may have RIP that overrides your Trap Settings, i.e., for overprinting, choke etc, the printer more than likely has these already set up. They may need to specify in their RIP settings the correct trap settings, overprint settings etc. depending on the way they recommend priniting it. Remember, not all printing companies use lithographic printers, so it could be gravure or something, it could be a stochastic RIP or something, not that these make a huge difference, but it could be the difference between a good print job and a great print job.
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