Sealing with what? You either use a guard after polishing, which gets burnished, or an impregnating sealer. Typically you would buff afterwards to remove any residue. I just did my garage this past weekend and sealed with an impregnator, no topical.
No finished pics yet because I had to move all my stuff back in with rain coming, but here is what the sealer does.
PROSOCO SLX 100
Here is one I did with a guard that got burnished.