Join Date: Jul 2010
Location: Outside Philadelphia, PA
How large a tank are we talking about?
Hoe deep are the scratches?
If it's a small tank, your best option is to just replace the tank. If it's a larger, but more or less a standard tank, see if you can turn it around so the scratches are in the back.
It is possible to buff out very fine scratches, but it'd a massive, messy job. Basically, if you can feel the scratch, or a fingernail catches on it, the scratch is too deep to buff out.