A penetrating sealer protects the pavers from potential stains from car oil, tire-markings, grease, or algae. It typically makes the color of the pavers appear richer, almost as they would appear when wet. Penetrating sealers also prevent water from entering the pavers. In colder climates, water that freezes inside a paver can break or weaken it.

Some homeowners decide not to apply penetrating sealers, because they would prefer an older or worn look. Additionally, because penetrating sealers usually need to be reapplied every few years, some homeowners choose to avoid future maintenance.