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Perkins Restoration buys Manganese Phospating Concentrate in five gallon buckets from Palmetto Enterprises (www.palmettoenterprises.net). Palmetto also offers quart and pint sizes for individual use. Mixing in a ratio of 14 ounces concentrate to 128 ounces (one gallon) water activates the phosphating chemical reaction. Zinc Phosphate is also available but, according to Bob Perkins, Manganese seems to work a little better to get the correct darker gray appearance.