So it will etch where the part is at the surface... hmmm. Looks like the barn cleaning phosphoric acid I used to strip a couple fenders. I could feel the line with a finger nail.
You can see the etch lines in the fender, where I only had the bottom submerged to dissolve the rust in the pits.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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