Most plates, if done properly, will hold up fine to high temperatures.
Yes, you need to remove the real chrome first. Yes, use lacquer to mask off certain areas and they won't plate.
You're plating using Copy Chome™ not real chrome, so you'll need to mask that off too, otherwise the gold will plate over the Copy Chrome™
The included pens allow you to be very precise with the plating solution, so if you have a steady hand, you might be able to get away without lacquering.
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