Re: using phosphoric acid and primer

Posted by Brad_bb on April 24, 2006 at 12:17:01 from (209.221.240.48):

In Reply to: using phosphoric acid and primer posted by 1951G on April 05, 2006 at 07:47:45:

For sandblasted cast iron, I agree that you don"t need a metal conditioner as long as you don"t have rust starting. I am an avid user of PPG DX579 metal prep (mild phosphoric acid solution that you dilute with water) and PPG DPLF Epoxy sealer primer. Both are excellent product and when used correctly will prevent rust and seal out moisture from the metal. The application of DX 679 is different from what you describe though. You apply it diluted per the directions. You can use a scotchbrite pad to do any scrubbing necessary. Application is usually 5-15 minutes tops. It will remove new light surface rust and etch/clean the part in preparation for sealer primer. You need to rinse the parts completely with clean water. I prefer hot water through my heated pressure washer. The how water will help you dry the parts quicker. You then want to use compressed air, blue paper shop towels, fans etc to get the parts dry as quickly as possible. Then get them in primer right away. They you are golden. You can top coat as you like. I like PPG single stage acrylic urethane. What you pay extra for this paint, you get back in durable protection and color hold out.

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