“Which sealer is best” doesn’t have one answer, because penetrating and topical sealers solve the problem in different ways and leave a different finish behind. The right choice depends on the material and what you want the surface to look like afterward — not on one being generally superior to the other.
How penetrating sealers work
A penetrating, or impregnating, sealer soaks into the material itself rather than sitting on the surface. It reacts within the pores of the concrete or stone, blocking water and the salts it carries while letting vapour still pass through — which matters for a surface’s long-term health, since trapping moisture inside a material it can’t escape from causes its own problems over time.
Because it works below the surface, a penetrating sealer leaves the material looking almost exactly as it did before — no shine, no colour change, just protected. That’s usually the right call for natural stone, where the appearance of the material is the reason it was chosen in the first place.
How topical sealers work
A topical sealer forms a film on top of the surface rather than soaking in. That film is what gives topical products their visible effect — a deepened colour, a satin sheen or a wet-look finish, depending on the product — which is why they’re often chosen for driveways and patios where people want the surface to look refreshed, not just protected.
The tradeoff is that a topical sealer is a coating, which means it wears from foot and vehicle traffic over time and eventually needs reapplication sooner than a penetrating sealer in a comparable location.
Matching the sealer to the material
- Natural stone (slate, sandstone, limestone, granite) — almost always penetrating, to protect without altering the stone’s natural look.
- Stamped or coloured concrete — often topical, since a sheen or colour enhancement suits decorative concrete that was already finished for appearance.
- Driveways and garage aprons — frequently penetrating for protection against oil and tire marks without changing the surface’s traction or look, though a topical option exists where a enhanced finish is wanted.
- Pavers — matched to whether the joints have been re-sanded; see paver resanding and sealing for how the two steps work together.
Why we show you both before you choose
The difference between the two is easier to see than to describe, which is why we show both options on the actual surface before a final decision rather than describing them over the phone. What looks right on one material can look wrong on another, even with the identical product.
It still needs a clean, dry surface either way
Neither sealer type works correctly applied over dirt, moss or an existing stain — see what causes efflorescence on concrete and pavers for why sealing over an unaddressed moisture issue doesn’t solve it. The wash-and-dry step is identical regardless of which sealer is ultimately chosen.
Tell us the surface, the material and what look you’re after, and we’ll recommend the sealer that actually fits — not the one that’s easiest to apply. Concrete and stone sealing covers the full process from assessment through application.