About 4-5 hours. Started with the #3 by hand for the deeper scratches, then used a 6" palm polisher for the #2 and #1 compounds.
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Went ahead and spaced the shims every 6". May be overkill but figure better safe than sorry. Tank is 100% filled now so leak test in progress (fingers crossedIf all goes well then I'll drain it down in a few days and start working on the 3D background for it.