Will the sealer change the colour of my paving?

Only if you want it to. An invisible product leaves the colour alone, a wet-look sealer deepens it permanently, and a colour sealer gives it a new shade.

How do I know when to seal again?

By how the water behaves. While it still beads on the surface, the treatment is working. Once water starts soaking in and dark patches return after rain, the protection has worn out.

Can I apply sealer to wet paving?

No. Water occupies the pores the product is meant to enter, and stays trapped under the film. The result is often a milky bloom that cannot be removed without stripping the coat. The exceptions are the few products that tolerate slight surface dampness.

Will sealing make the paving slippery?

Not if you choose a penetrating product - it forms no film on the surface and does not change its grip. If the surface is already slippery, choose an anti-slip treatment rather than a sealer.

Both give a wet look. HK-2 is water-based, solvent-free and applied to saturation. SK-2 is solvent-based, covers 5-10 m²/l and requires the surface to be kept out of use for a day.

Does the 28-day seasoning apply to old paving too?

No - that condition is about newly manufactured paving and concrete units. Paving laid years ago is seasoned; what matters then is only whether it is clean and dry.

Yes - the flash point is approx. 51 °C. Work away from sources of ignition and ensure good ventilation, as this is a solvent-based product.

Solvent-based block paving sealer, wet look SK-2 CTS Chemistry

Visibly deepens the colour of block paving and forms a protective layer on it. One litre of this solvent-based sealer covers 5-10 m² in a single application; allow foot traffic after 24 hours. Do not apply it over visible efflorescence.

Surface

Block paving

See the whole range

Block paving

SK-2 is the only solvent-based paving sealer in this range. Coverage is 5-10 m² per litre for a single application.

It forms a protective layer on the surface and deepens the colour of the paving. Before sealing, new paving and concrete need 28 days of seasoning from manufacture, and the surface can take foot traffic no sooner than 24 hours after the work.

It dries in 2-3 hours depending on temperature and humidity; work at 5-30 °C. The flash point is approx. 51 °C - the product is flammable, so keep well away from naked flames.

The usual reason a sealing job fails is not the product but the substrate. A sealer will not bond to a surface with grease, lime efflorescence or an old coating on it.

Wash the paving. Lift oil stains with a degreasing cleaner - water alone, even under pressure, will not shift them.
Remove lime efflorescence with a product made for it, not with hydrochloric acid from the builders' merchant.
Make good the joints and let them set. Sealer applied over an empty joint runs straight into the sub-base.
Wait until the paving is dry all the way through, not just on top. Moisture trapped under the film can bloom it white.
Check the forecast. Rain within a day of application will wash off a fresh coat.

New paving has to season first - usually around 28 days from the date the block was made. You will find the exact time for each product in its technical data.

Before sealing the whole area, test on a patch hidden by a planter or in a corner of the patio. The same product can read differently on two batches of the same material, and on a surface with old coating left on it, it will not bond at all.

Coverage: 5-10 m²/l
Coats: 1
Base: solvent-based
Finish: wet look
Application method: roller, brush, spray
Dilution: Ready to use - do not dilute
Application temperature: +5 to +30 °C
Drying time: 2-3 h, depending on temperature and humidity
Foot traffic: after 1 day
Substrate curing: min. 28 days
Where to use: indoors, outdoors
Density: approx. 0.9 g/cm³
Flash point: approx. 51 °C
Water absorption coefficient: Wd < 0.1 kg/(m²·√h) or < 7.5 % per PN-EN 1504-2 / EN 13580
Penetration depth: > 2 mm, per EN 14630
Note: do not seal a surface with visible efflorescence

Will the sealer change the colour of my paving?: Only if you want it to. An invisible product leaves the colour alone, a wet-look sealer deepens it permanently, and a colour sealer gives it a new shade.
How do I know when to seal again?: By how the water behaves. While it still beads on the surface, the treatment is working. Once water starts soaking in and dark patches return after rain, the protection has worn out.
Can I apply sealer to wet paving?: No. Water occupies the pores the product is meant to enter, and stays trapped under the film. The result is often a milky bloom that cannot be removed without stripping the coat. The exceptions are the few products that tolerate slight surface dampness.
Will sealing make the paving slippery?: Not if you choose a penetrating product - it forms no film on the surface and does not change its grip. If the surface is already slippery, choose an anti-slip treatment rather than a sealer.
SK-2 or HK-2?: Both give a wet look. HK-2 is water-based, solvent-free and applied to saturation. SK-2 is solvent-based, covers 5-10 m²/l and requires the surface to be kept out of use for a day.
Does the 28-day seasoning apply to old paving too?: No - that condition is about newly manufactured paving and concrete units. Paving laid years ago is seasoned; what matters then is only whether it is clean and dry.
Is it flammable?: Yes - the flash point is approx. 51 °C. Work away from sources of ignition and ensure good ventilation, as this is a solvent-based product.