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Warren Hall Student
Join Date: Aug 2000
Location: Los Angeles Ca.USA
Posts: 4,104
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You need a phosphoric acid that also has zinc and phosphate. The zinc and phosphate leave a coating that keeps the flash away and helps protects against future rust.
There are several versions. PPG DX520 Metal conditioner (not DX 579 Metal cleaner), Easwood Fast Etch, or Por-15 Metal Ready.
All the paint suppliers in this area seem to carry the PPG DX579 Metal cleaner but not the DX 520 Conditioner. DX 579 has the acid but not the zinc and phosphate and it will flash rust after you rinse.
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_____In memoriam_____
Warren Hall 1950 - 2008
_____"Early_S_Man"_____
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