I'm not familiar with the specific type of granite you have by name (Comet), but in my experience most if not all of the graninte I've seen has small inclusions, fissures, and pits. Our vanity top has it, and our countertop has it.

All the granite my fabricator gets is already polished, and although they add sealer after the installation, there's no process that I'm aware of to apply a resin to the polished surface that would make it absolutely smooth.

Having said that, I don't think you'll have a cleaning issue unless you have a really large pit or fissure that catches debris. If you do, the fabricator can fill individual imperfections with epoxy and polish that smooth, one at a time.

I'm not saying there's not a process of epoxying the entire surface, I'm just not aware of it if there is....