Efflorescence (salt deposits) on walls: Remove the salts with a nitrate remover, let the surface dry fully, then apply a silicone water-repellent impregnation in two coats using the wet-on-wet method. Wipe off any excess.
Modern silicone-based surface protection: monuments, buildings, paving and household surfaces.
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Hungarian silicone-based surface protection • 2768 Újszilvás
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FAQ – PAVING STONES: CLEANING & IMPREGNATION

White efflorescence or oil stains on your paving stones? Has the colour faded? What can you do?

Efflorescence: clean + impregnate Oil stains: remove + prevent Faded colour: stone balsam
Paving stone cleaning and impregnation – illustrative photo
Paving stone cleaning and protection

Good news: there is a practical solution.

Many people notice white patches on paving stones. This is typically efflorescence (salts that migrate to the surface with moisture and crystallise as the surface dries).

Efflorescence on paving stones

1) Efflorescence: what to do

There are two effective routes:

  • Prevention: impregnate the paving stones before laying (helps reduce efflorescence).
  • Correction: clean the salts from the surface, then after full drying impregnate the paving stones.

Recommended impregnation: AQUA-STOP W Paving Stone Impregnator – Concrete Stone Protector.

Concrete Stone Protector – label

Recommended cleaning: DRY-CLEANING Paving Stone Cleaner – Concrete Stone Cleaner. It also helps remove rust stains that can develop, for example, due to iron-rich irrigation water.

Concrete Stone Cleaner – label

2) Oil stains: remove and prevent

Oil stain on paving stones

We have a product that can typically remove 65–95% of oil staining from paving stones (in some cases even 100%). The result depends on several factors:

  • how contaminated the leaked oil is,
  • the type of oil,
  • how long ago it leaked (penetration depth, sunlight/heat exposure),
  • the paving stone quality and porosity.

Recommended product: DRY-CLEANING Oil Stain Remover.

Oil Stain Remover – label

Oil stain removal – example

Prevention: if you would like to avoid future oil problems, use AQUA-STOP W Oil-repellent impregnator – Concrete Stone Protector Max.

Concrete Stone Protector Max – label

Oil-repellent effect – illustration

The photo shows the difference clearly: oil soaks into an untreated surface, while on an impregnated surface it can often be wiped up even with a paper towel.

3) Faded paving stones: refresh the colour

Over time, the colour of paving stones can fade. For colour refresh and a more even appearance, we recommend AQUA-STOP W Paving Stone Balsam – Concrete Stone Balsam.

Concrete Stone Balsam – label

Colour refresh result – example

In brief: what is worth doing?
Efflorescence: clean, then after the surface is fully dry, impregnate.
Oil stains: treat with an oil stain remover (repeat if needed), then prevent with an oil-repellent impregnation.
Faded paving stones: refresh the colour and unify the surface with a paving stone balsam.
Wipe back excess: always wipe back any excess impregnation left on the surface.
Important: before impregnation the paving stones must be clean and completely dry.
Common mistakes
  • impregnation on a damp surface → weaker performance, patchiness
  • insufficient cleaning → dirt gets sealed in
  • leaving excess on the surface → streaking, sticky feel
  • giving up after one attempt on oil stains → repeat treatment is often required
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