Repair methods
Penetrating concrete sealer
What kind of sealer should go on my driveway?
If the goal is reducing water and salt uptake without changing how the concrete looks or feels, a penetrating sealer is the type designed for that. It soaks in and reacts or lines the pores rather than forming a film on top.
The trade-off is that it does very little for appearance. It will not enrich colour, add gloss, or hide anything.
What the method is
The product is applied to clean, dry concrete and absorbs into the surface, where it either reacts chemically or lines the pore structure to reduce water absorption.
Because there is no surface film, appearance is largely unchanged, slip characteristics are largely unchanged, and there is nothing to peel, blister or wear off unevenly.
It is generally the type recommended where freeze-thaw and de-icing salt are the concerns rather than appearance.
What it does not do
- It does not change appearance, enrich colour, or add gloss.
- It does not repair or hide surface defects, and it will not consolidate a dusting or friable surface.
- It does not stop water arriving; it reduces how much the concrete takes up.
- It does not last indefinitely and needs reapplying on a cycle that varies with exposure.
- It does not work on a surface that is still losing material.
What you can safely check yourself
- Rub the surface first. If it sheds grit, sealing is premature — the surface needs addressing before protecting.
- Note whether you want any appearance change. If you do, this is not the right type.
- Note what de-icer is used and how wet the slab gets, since those drive the reapplication interval.
Questions to ask whoever comes out
- Which product, and is it appropriate for this exposure?
- How often does it need reapplying here, and what does that cost each time?
- What surface preparation is included?
- Will this change the appearance or slip resistance at all?
- Is the surface sound enough for a sealer to be the right spend right now?
Where estimates for this commonly differ in scope
These are the places two prices for apparently the same work stop being comparable.
- Reapplication interval is the number that decides ten-year cost and is almost never quoted.
- Preparation and cleaning may or may not be included.
- Some estimates bundle crack treatment with sealing, obscuring which buys what.
Often reasonable to monitor
Conditions in this band are frequently stable and frequently cosmetic. Monitoring means dating a photograph and re-photographing from the same spot, not ignoring it.
Who tends to do this work
- A concrete repair specialist
- A residential flatwork concrete contractor
ConcreteOwner does not inspect, certify or approve contractors. This describes which trade usually holds this work, not a recommendation of anybody in particular.
Common questions
Will a penetrating sealer change how my concrete looks?
Very little, which is the point. There is no surface film, so no gloss, no colour enrichment and no visible layer. If you want the concrete to look different, you want a topical product and a different set of trade-offs.
How often does it need redoing?
It varies with the product, the exposure, the traffic and how much salt and water the surface sees, so the honest answer is a range that depends on your conditions. Ask the contractor for their expectation on your slab and what it would cost to redo — that figure is what makes sealing comparable to resurfacing.
Can I seal concrete that is already scaling?
Not usefully. A sealer protects sound concrete from taking up water; it does not consolidate material that is already coming away. Sealing a scaling surface puts product into something that is detaching. Address the surface first, then protect what remains.
Where to go next
Related problems
Worth comparing
What drives the cost
Methods that may apply
Want a straight answer about penetrating sealer?
Both decision tools are free and need no contact details. If you would rather have somebody local look at it, you can ask us to review whether we can match you — and we will say plainly if we cannot.