I used one of these kits and the result...poor in all fairness.
I had all my components blasted and did everything the kit instructions stated, it all looked ok but what a hassle and the finish does not last long before it started to oxidise again.
Best thing to do is take it all to the professionals and spend the money, I dropped a whole load off such as springs, catches, bolts etc and it cost less than Β£90!
Cheers Al