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Acid etching aluminum, twice

We acid etch aluminum diesel fuel tanks. After etching the scratches show up. We sand off with increasingly finer sandpaper to remove the flaws but cannot get the repaired area to match the original acid etched areas. Any ideas on how to do this?

THOMAS C. HABANEK
a tank mfgr. - CLEVELAND , Ohio
2003

You may want to try heavy caustic etch to attain a matte finish. This etching however will take a few microns from the surface.

Ciraco DiPaloloco
- Toronto
2003

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