Concrete and floor sealers

Sealers for garage and workshop floors, patios, architectural concrete and precast units that protect concrete against water uptake, oil and dusting.

What gets spilled
For rain alone, water repellency is enough. Oil and grease need a product that is oil-repellent as well.
Indoors or out
Outdoors, frost resistance and vapour permeability matter; indoors, ventilation with solvent-based products.
Age of the slab
Fresh concrete is still giving off mix water and will push any coating off with it. Wait out the seasoning period given in the product's technical data.

42 products

Guides

Before you choose: how to pick the right product, prepare the surface and what to expect once it is on.

Concrete draws in water, and with it everything dissolved in it. A floor adds a second problem: whatever gets spilt on it. So you choose the product not only for the material but for what happens on it.

Garage floor sealer for concrete

In a garage the main enemy is oil, not water, so choose an oil-repellent sealer. EH-20 is a water-based water- and oil-repellent sealer: it limits the ingress of water and oils, leaves the colour of the concrete unchanged and stays vapour-permeable. With poor ventilation it is easier to work with than a solvent-based product. Where you can ventilate, the solvent-based EH-18 is an excellent choice, made for floors that carry traffic too - it adds no gloss and at most slightly darkens and mattifies the surface.

Remove oil stains before sealing - locked under the sealer, they stay in the concrete for good. Single stains come off with OL-1, and a floor that is greasy all over with Net’Guard Ultra 4 in 1. With EH-18 and EH-20, plan a day with no car in the garage. We set out the whole sequence in the guide sealing a garage floor.

Outdoor concrete sealer

On a terrace or a fence, concrete goes through cycles of soaking and freezing: water that does not get in cannot burst it as the temperature crosses zero. Protect terrace slabs with the clear HBP-1 or with HBP-2, which permanently deepens the colour without making the surface more slippery. Split-face fence blocks and low walls are exceptionally absorbent - the clear, vapour-permeable VBe-1 is made for them. Edgings, palisades and garden concrete products are covered by the water-based EH-17, which dries in 1-2 hours at 20 °C.

Architectural concrete sealer

On a wall, vapour permeability is what counts, because the wall has to release moisture outwards. The clear VB-1 leaves architectural concrete the way it was designed. VB-2 lowers water uptake further and permanently deepens the colour - seal the whole wall with it in one go, because the line between treated and untreated concrete will show.

Before you seal

Fresh concrete releases its mixing water for weeks, and a sealer applied too early blocks its way out - some products need 28 days of curing. Solvent-based products need a dry substrate: some require moisture below 5-6 %. We compare garage, terrace and wall in the guide sealing concrete and floors.

Questions before you choose

Will a sealer stop the floor dusting?

Yes, as long as the problem is loose particles on the surface. Products forming a dust-free polymer layer bind them on top. They do not replace a hardener where the concrete itself is dusting because it was poorly floated.

How do I check the concrete is dry enough?

The simplest method is a sheet of polythene taped down tightly for a few hours: droplets underneath mean the slab is still giving off water. On larger jobs a moisture meter is used.

Can I seal a garage floor in winter?

Yes, if the substrate and the air are at the temperature the product requires - most often a minimum of +5 °C. In an unheated garage the concrete is often colder than the air, so measure the slab.

Does a sealer protect against road salt?

Yes - it limits the ingress of water and the salts dissolved in it.