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Is there any way to flatten and fire polish the edges of a rectangular pot melt and still maintain crisp corners?

Trying to do both at the same time, IMO, is difficult to impossible.

It's best to get the melt flat in the first place. If you review Doc Immerman's tutorial you'll see he has a hold at 1500. I use the same hold. It flattens out the top of the melt. Leaving off the hold can result in spikes and bumps from the dropping melt.

The only way I know to get crisp, polished edges/corners is A) dam* and cold work (all the way to a cork belt) the edges after the last firing, B) cold work the edges to the shape desired and refire enough to polish unless C) you're going to slump next. Then just coldwork the edges as smooth as possible and they will shine when you slump.

*Without damming the edge on 1/4" and thicker will round over.

Happy Fourth..................Jim

Flattening takes a much hotter temperature than firepolishing. If you want to flatten and not lose the rectangular shape, use a dam. If you do that, the top will be firepolished but not the sides (where they're touching the dam.