As it happens I once used to work as an apprentice in an aerospace electroplating company and once in a while we would get company's boses mates ask for their jag suspension parts to be cadmium plated.
We would first degrease them, then sand blast, then rinse and then leave in highly concentrated hydrochloric acid for 10 minutes (the stuff was so strong it would go through you if it dripped onto your body) and then it would get plated.
Hot dip galvanising is a totally different process but preparation should be the same.
I rang about for a few quotes and the cheapest I got was £900 for the single front subframe which is nuts!
I will ask my contacts in Poland maybe they can find a place that does it really cheap, but already this idea is starting to look very expensive and long winded.
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