I read that a number of people look to have part reparkerized and look for home brews to do this. While some of the home brews may work I recommend that one locates a professional shop to get the best finish. I run a shop that offers Parkerizing or more correctly manganese phosphate or sometimes zinc phosphating. I do work for a well known museum and a number of restoration shops. If you would like more information please contact me. - S Berg