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Coatings and impregnations that keep water, chlorides and carbon dioxide out of concrete facades, bridges, car parks and repaired structures. Choose a clear impregnation, an anti-carbonation coating or a crack-bridging coating to suit the exposure.
General guidance based on the manufacturer data sheets. Site conditions differ: confirm the system with MCT before you start. Where we do not name a product, ask us and we will confirm the right one.
Clear silane impregnations repel water and chlorides without changing vapour permeability (Sikagard-705 L p.1). Sikagard-680 S Betoncolor is an anti-carbonation coating, clear or coloured, for exterior use (p.1). Sikagard-550 W Elastic (G) bridges cracks and resists carbonation and chlorides (p.1).
Repair spalling and cracks first (FerroGard-903 Plus p.3). Before silane, repair cracks wider than 750 µm (Sikagard-705 L p.3). Clean by steam, blast cleaning or high-pressure water jetting; new concrete must be at least 28 days old (Sikagard-680 S p.4).
Prefill blowholes, cavities and pores so the coating is defect-free (Sikagard-680 S p.4). Use Sikagard-720 EpoCem (professionals only), MonoTop-620 or SikaRep Fine PK as pore filler (Sikagard-720 EpoCem p.1; MonoTop-620 p.1; SikaRep Fine PK p.1).
Thin layer render Concrete pore filler/ levelling mortar Repairing minor defects (pores and honeycombed concrete) Protecting concrete in aggressive and chemical environments As a Temporary Moisture Barrier (TMB) for Sikafloor® or Sikagard resin products Sui… (TDS p.1)
Sika MonoTop®-620 can be applied with or withour a reinforcement matt, over concrete or mortar surfaces or over SikaTop® or Sika Monotop® mortars. It is suitable for the following uses: Use as a concrete/ mortar pore sealler or levelling mortar, Thin layer render over vertical or horizontal struc… (TDS p.1)
SikaRep® Fine PK can be used as a: Pore sealer / finishing mortar on cementitious substrates, Thin layer rendering on horizontal and vertical areas in building and civil engineering construction, for external and internal finishing etc, Levelling mortar on uneven substrates, and profiled concrete… (TDS p.1)
Where steel is at risk, apply FerroGard-903 Plus first; no further treatment is needed before Sikagard impregnations or breathable coatings (FerroGard-903 Plus p.4).
For the corrosion protection of steel reinforced concrete structures above and below the ground. (TDS p.1)
Sikagard-705 L (2–3 coats, p.2) and Sikagard-704 S suit heavy chloride and marine exposure (p.1); Sikagard-740 W is water-based for vertical and trafficked horizontal areas (p.1); Sikagard-700 S PK suits concrete, render and brickwork, not below ground (p.1, p.2). Apply on a dry surface (Sikagard-704 S p.3).
Sikagard®-705 L is used as water-repellent impregnation (hydrophobic treatment) for absorbent substrates such as concrete in civil engineering or building concrete structures subjected to heavy stress due to freeze and thaw cycles and de-icing salts and chl… (TDS p.1)
Sikagard®-704 S is used as water-repellent impregnation (hydrophobic treatment) for absorbent substrates such as concrete in civil engineering or building concrete structures subjected to heavy stress due to freeze and thaw cycles and de-icing salts or chlo… (TDS p.1)
Sikagard®-740 W is used as water-repellent impregnation (hydrophobic treatment) for absorbent substrates such as concrete in civil engineering or building concrete structures in both vertical and horizontal traffic area: Suitable for protection against ingress (Principle 1, method 1.1 of EN 1504-… (TDS p.1)
Sikagard®-700 S PK is used as water repellent and colourless protective surface treatment on absorbent exposed materials such as concrete, cementitious rendering, concrete tiles, fibre cement, brickwork (clay and lime sand, non-vitrified), natural stone. (TDS p.1,2)
On very dense or very porous concrete, prime with Sikagard-551 S Elastic Primer (p.1). Apply Sikagard-680 S Betoncolor in 2 coats (p.3), or the crack-bridging Sikagard-550 W Elastic (G) for cracked or masonry facades (p.1). Protect from rain: 680 S for 24 hours, 550 W (G) at least 4 hours (Sikagard-680 S p.5; Sikagard-550 W Elastic (G) p.5).
As a protective and decorative coating for: The protection and enhancement of concrete cementitious substrates on building and infrastructure elements, Reducing the deterioration of concrete and assisting with controlling the corrosion of any embedded steel reinforcement, Increasing the service l… (TDS p.1)
Sikagard®-550 W Elastic (G) is used for protection and enhancement of concrete structures (normal and lightweight concrete), especially exposed outdoor concrete surfaces with a risk of cracking. (TDS p.1)
The right product here depends on your site. We confirm it before naming it.
For steel members, blast clean to Sa 2½ and prime with SikaCor Zinc R zinc-rich epoxy (SikaCor Zinc R p.1, p.3), then top-coat with SikaCor EG-5 polyurethane over the system's intermediate coat (SikaCor EG-5 p.1). Both are for experienced professionals only (p.1); ask us for the intermediate coat.
Robust corrosion protection primer for steel offering a wide range of applications. (TDS p.1)
In combination with 2-pack primer and intermediate coats of the SikaCor® and Sika® Permacor® product range for heavy duty corrosion protection of atmospheric exposed and submerged steel structures. (TDS p.1)
Refresher coats of Sikagard-680 S can be applied without priming if the existing coat is fully bonded and cleaned (Sikagard-680 S p.3). Dark shades fade faster and may need earlier refresher coats (p.4).
A starting point for a site proposal. Quantities, prices and the final specification follow a site visit or photos.
| Step | Product | Pack | Source |
|---|---|---|---|
| 3. Fill pores and blowholes | Sikagard-720 EpoCem (professionals) | Pre-batched 21 kg sets. | TDS p.1 · May 2021, Version 02.01 |
| 3. Fill pores and blowholes | Sika MonoTop-620 | — | TDS p.1 · May 2021, Version 01.01 |
| 3. Fill pores and blowholes | SikaRep Fine PK | — | TDS p.1 · October 2023, Version 01.03 |
| 4. Add a corrosion inhibitor (optional) | Sika FerroGard-903 Plus | 25 kg pail | TDS p.1 · May 2025, Version 03.01 |
| 5. Clear water-repellent impregnation | Sikagard-705 L | 18 kg pail and 180 kg drum | TDS p.1 · May 2021, Version 03.01 |
| 5. Clear water-repellent impregnation | Sikagard-704 S | 20 kg pail and 160 kg drum | TDS p.1 · May 2021, Version 01.01 |
| 5. Clear water-repellent impregnation | Sikagard-740 W | 19 kg (20 l) pail and 210 kg (200 l) drum | TDS p.1 · May 2021, Version 01.01 |
| 5. Clear water-repellent impregnation | Sikagard-700 S PK | 1000 ltr IBC | TDS p.1,2 · August 2026, Version 01.01 |
| 6. Protective coating | Sikagard-680 S Betoncolor | — | TDS p.1 · December 2022, Version 04.01 |
| 6. Protective coating | Sikagard-550 W Elastic (G) | — | TDS p.1 · May 2025, Version 04.01 |
| 7. Exposed steel members | SikaCor Zinc R (professionals) | — | TDS p.1 · October 2022, Version 05.01 |
| 7. Exposed steel members | SikaCor EG-5 (professionals) | — | TDS p.1 · September 2023, Version 08.02 |
Sikagard-705 L is a colourless liquid (Sikagard-705 L p.2), and Sikagard-680 S also comes in a clear version (Sikagard-680 S p.1). Silane can darken some concrete, so try a sample area (Sikagard-705 L p.3).
Sikagard-680 S and Sikagard-550 W Elastic (G) are water-vapour permeable (p.1), and Sikagard-705 L does not change water-vapour permeability (p.1).
Not with limewash or cement paint (Sikagard-705 L p.3; Sikagard-700 S PK p.2).
Not when rain is expected. Sikagard-680 S needs 24 hours of rain protection and Sikagard-550 W Elastic (G) at least 4 hours at +23 °C (Sikagard-680 S p.4, p.5; Sikagard-550 W Elastic (G) p.4, p.5).
Ask us: it depends on site conditions. Dark shades fade faster and may need earlier refresher coats (Sikagard-680 S p.4).
Steps and product facts are taken from the manufacturer data sheets (page cited). Products are named only where the data sheet confirms the use; quantities follow a site visit or photos. General guidance: check the data sheet or ask us before you start.