Hi stringr, most will argue an engineered stone like quantum quartz or Caesar stone does not require sealing. In saying this… as stone is still a few percent porous it can definitely be sealed. Basically any porous stone whether natural or man made can have a sealer product applied. Stick with a penetrating sealer and simply remove any excess left on the surface once product has penetrated your stone. This is achieved by first dabbing up any excess with a damp rag and then giving it a once over with a microfiber cloth!