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Dulite in Connecticut have Park solution available. I'm not sure if they only have manganese or offer zinc also. Very nice folks to deal with but they don't sell small quantity anymore because of the sheer expense of shipping it by truck freight. Common carriers won't carry it because it's considered hazardous material. Five gallons is the minimum. I use the manganese for restorations and after bead blasting with fine glass beads, the finish is outstanding. Usually too good to paint and bake!
I looked at the DuLite website this morning and they do have ZP440 available. Five gallons is the smallest you can get now thanks to the expense of truck freight because of hazmat.
I just cooked a pile of No.4 Enfield parts yesterday with the DuLite manganese phosphate and they are too nice to paint/bake which is happening today! I asked about their bluing, (black oxide) chemicals too when I spoke to them last year and they told me they are unchanged since developed preWW2. It's correct on North American production No.4 rifles and small parts as well as TSMG etc., etc..