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After sandblasting Ive applied a phosphoric acid this neutralizes any further flash rusting it leaves a film of phosphate salt which stops flash rusting for a few week as long as its not kept outside in the rain.
Prep for painting Ive used a green scotch pad to loosen the salt residue then wiped with an isopropyl alcohol wipe and ready for a epoxy primer coat,
The epoxy coat is non porous as I'm a weekend car restorer this is great because the metal is now sealed and its easy to remove if welding is required.
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