Ive used the eastwood zinc plate kit, great results for the money. You really feel good after its all done, seeing the results. Easy to do also. Make sure and get every bit of rust off the part though. When detailing carbs, I used the kit to replate linkage and it looked like new. I like using a cabnet sand blaster that I designate just for polishing and cleaning for small parts. I use glass bead in it. When I was rebuilding my govenor in my Farmall A some of the springs were rusty but still very usable. I sandblasted them with the glass bead, cleaned them up like new inside the spring as well. A wire wheel brush couldnt do that.
When using wire wheel on springs, it generally leaves little metal strands inside the springs (at least on my cheap wire wheels it did. If they are a light spring, you can bend it open while sandblasting. I never did try the zinc plating kit.... maybe next project whatever it may be.