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Palmetto Enterprises sells the concentrate that I have found to be some of the best around.
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+1 on Palmetto Enterprises. I cannot tell you how many FALs I have parkerized with Palmetto's solutions that came out looking great.
Thoroughly degrease before blasting. I blast with aluminum oxide. I rinse with boiling water before I put the part in the tank. Keep the temperature in the tank up. Use a candy thermometer to monitor the temperature.