Can I polish from a Silicon Carbide belt?

In general, no.

Even at 600 grit, the finish left behind by a silicon carbide belt is too rough to polish from. You generally need to move to a cork belt in order to pre-polish your glass and then to a felt belt or cerium impregnated belt for a final polish.

You can also fire polish from a cork surface. Fire polishing is also an option from the 600 grit belt, but it may or may not fit your final aesthetic.
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