Sealing Silestone Countertops. It's possible a permanent topical coating would help, but such coatings have their own problems, maintenance requirements, and are rather expensive to have applied. Unlike granite, Silestone doesn't require a sealer.
The deeper into the surface of the material the sealer penetrates, the better it will resist stains, keep out bacteria and clean up with just mild detergent and a wet wash cloth. Caesarstone's non-porous nature provides maximum resistance to staining and fully eliminates the need for any sealing. However, it is also porous and liable to suck up wine and tomato sauce spills.
Choosing the best countertop option for your bathroom or kitchen is tough, particularly with kitchens.
Ease of maintenance is another reason Silestone is starting to surpass other countertop materials.
Choosing the Right Sealant is Essential. One way to check your seal is to splash a little water on the surface. Silestone countertops are not very porous, so most likely will not absorb the enhancer sealer enough for this idea to work.