TLDR - The following bolt itshay was done because I wanted to learn how. It's not worth it. Just spend $1.5K on new bolts. That said, everything cost me about $150 bucks to do on my own.
So first you take the old bolts and strip off all the old coating. Acetate works great, but just about any acid will work. It's working when you see bubbles.
You know it's worked when it flash rusts after drying.
Then polish your itshay.
Use these brushes to do the heads.
Then clean any grease off with acetone.
Then make your own electroplating kit. I bought one of these thingies so I could control voltage. An actual regulator is around $200.
This one came with a bunch of different attachments. This one worked great.
Then make some alligator clips.
Next comes witchcraft. On a serious note, use epsom salts to increase conductivity as table salt can give chlorine gas off under the right circumstance. That's bad.
Make zince acetate solution.
This was half of the cost. On another more serious note, don't uckfay around with this. It's also bad for you.
You can buy an electromagnet stir thing that whirls around for $250 or just make yourself something that will agitate the solution throughout the plating process for $15.
More witchcraft.
First batch looked like dick so it needed to be re-done.
Changed a few things. Second batch was left in the yellow chromate for too long.
Third batch looking better.
What it looks like after drying. To get that shiny yellow finish you see from OEM hardware you need to add brightener and then polish the bolts before yellow chromating. That is basically just for appearance and since I only want the bolts to not rust this will work fine. Plus this already took way more time than I thought. Individually polishing bolts would add another week onto this.
And for a final serious note, don't use chromium to plate. You'll end up killing yourself which is no fun or anyone.