Quartz Countertop & Sealers
The general though is that Quartz countertop do not require sealing, due to the binders & very low or no porosity.
If however, if you feel your quartz countertop could use more protection based on observations or pure desire, one can find online a product called Quartz Nanoguard Countertop Protector. It claim to helps repel liquids and block stains without changing the look and feel of Quartz or Quartzite.
