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SAJ · 10-13-2018, 03:36 PM

Chrs1961815, You mention "sealing the rust in" . The purpose of the phosphoric acid is to convert the rust to black iron phosphate. The rust is gone, not sealed in, and the phosphate surface is passivated and resists re-rusting. This is the similar to the "Parkerising" process used on Fords before painting and on most other new body work even now.
SAJ in NZ

10-13-2018, 03:36 PM	#14
SAJ Senior Member Join Date: Jul 2010 Location: Auckland, New Zealand Posts: 515	Re: 28 Roadster Door Rust Repair Chrs1961815, You mention "sealing the rust in" . The purpose of the phosphoric acid is to convert the rust to black iron phosphate. The rust is gone, not sealed in, and the phosphate surface is passivated and resists re-rusting. This is the similar to the "Parkerising" process used on Fords before painting and on most other new body work even now. SAJ in NZ