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!