A water-based siloxane water repellent that leaves the colour of the paving unchanged. It lowers water uptake, limits efflorescence and biological growth, and leaves the pores open - the material keeps its vapour diffusion.
Surface
Block paving
The surface the manufacturer intends this preparation for.
HK-1 is the invisible version of the CTS sealer for block paving. Once dry the paving looks exactly as it did; what changes is how water behaves on it.
The base is a single-component siloxane product, water-based and solvent-free. It lowers water uptake, making it harder for rainwater and the compounds dissolved in it - oils, juices, coffee - to enter. It leaves the pores open: gas and water-vapour diffusion are unchanged.
Choose it if the colour of your paving suits you and is to stay that way. If the paving has faded and the point is to deepen the colour, the product you want is HK-2.
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.
New paving has to season first. Manufacturers state that period on the data sheet - usually around 28 days from the date the block was made. The figure for each product is under "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.
That depends on the finish given in the technical data. An invisible product leaves the colour alone, a wet-look version deepens it permanently, and a colour sealer gives it a new shade. Each product's finish is listed under "Technical data".
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. We do not quote a number of years, because it depends on traffic, sun and whether the drive is salted in winter.
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 - products that allow slight surface dampness - say so in their technical data.
Use the calculator under the product description: it takes the manufacturer's coverage figure, the number of coats and the absorbency of the substrate, and turns them into pack sizes. On older, thirstier paving, work to the lower end of the coverage range.
Penetrating products form no film on the surface and do not change its grip. Where a manufacturer says something about slipperiness, we quote it in the technical data. If the surface is already slippery, the right product is an anti-slip treatment, not a sealer.
Composition and finish. The -1 versions are single-component, based on siloxanes alone, and dry colourless. The -2 versions are multi-component - siloxanes with modified silanes - and give a lasting wet-look finish. Both meet PN-EN 1504-2 tab. 3 and both leave the pores open.
The manufacturer of this range publishes no coverage in square metres per litre, because the product is applied to saturation and the absorbency of the material decides consumption entirely. The practical method: seal one square metre, measure what it took, and multiply by your area with some margin.
The manufacturer states 5-6 hours. During that time the freshly sealed surface also has to be kept out of direct sun.
The manufacturer allows slight surface dampness - which is unusual in this class of product. Wet paving is a different thing from slightly damp, though; if in doubt, wait.
The technical sheet and safety data sheet will be available after approval.
This product has no stated coverage yet, so we cannot work out the requirement.
The manufacturer publishes no coverage figure for this range. The sealer is applied to saturation in one heavier coat, repeated wet-on-wet on absorbent material.
The calculator starts once the manufacturer states the coverage.
An impregnation will not bond to a surface with anything left on it. This is the most common cause of complaints.
Go directly to the right category. We do not imply compatibility across materials.