Sealing Schedules: Engineered Quartz, Quartzite and Marble Compared

Sealer sales are driven by anxiety rather than by porosity. Here is what each surface actually requires.

Engineered quartz: never

A resin-bound composite is non-porous by construction. Sealing it leaves a film that hazes and eventually needs stripping. Any contractor who recommends sealing engineered quartz is selling a service the product cannot use.

Quartzite: every 12 to 24 months

Dense but not impermeable. High-traffic zones around the sink and cooktop reach the end of a sealer cycle well before the far end of a perimeter run, so test where the work happens.

Marble and limestone: every 6 to 12 months

Genuinely porous and chemically reactive. Sealing prevents staining but never prevents etching, so set expectations accordingly on any calcite-based surface.