Sika Sikagard-552 IN Primer W
Water-based acrylic adhesion primer that keys concrete and dense mineral substrates for Sika’s water-dispersed protective and anti-carbonation coatings, part of an IRC:SP:80-compliant system.
What is it?
A one-component, water-dispersed acrylic (acrylate) primer that promotes adhesion for water-based polymer protective coatings on concrete and dense mineral surfaces.
Where is it used?
Concrete facades, bridge and structure surfaces, fibre cement, aerated concrete, gypsum and thin rendering before a Sikagard water-based topcoat is applied.
Why use it?
It wets and seals the substrate, evens out porosity and gives the topcoat a reliable, breathable key so anti-carbonation coatings bond and perform as specified.
How is it applied?
Supplied ready to use in a 10 kg bucket, shaken well and applied as a single coat by brush, roller or airless spray; not to be diluted.
About Sika Sikagard-552 IN Primer W
Sikagard-552 IN Primer W is Sika’s water-based acrylic priming coat, engineered as the first layer beneath the company’s water-dispersed Sikagard protective and anti-carbonation coatings. On its own it is not a decorative or barrier finish; its job is to prepare concrete and dense mineral substrates so the topcoat that follows adheres uniformly and lasts. Built on an acrylate polymer dispersion that is solvent free, it is a milky white liquid that dries to a thin, breathable film. Because it forms part of a system that meets IRC:SP:80 requirements for protective coatings, it is a common specification on Indian infrastructure and building-repair jobs where durable concrete protection is called for.
For engineers and applicators, the appeal is practical. Fresh and old concrete rarely present a uniform face: some areas drink up coating, others reject it, and thin renderings or fibre-cement panels behave differently again. A dedicated primer levels that behaviour out. Sikagard-552 IN Primer W penetrates and stabilises the surface, cuts down uneven absorption, and leaves a consistent bond layer so the protective coat above goes on at the right film build and cures as intended. It is also low odour and environment friendly, which matters on occupied buildings, enclosed facades and repair works where solvent primers are awkward to use.
The technical insight
The primer works by anchoring a thin acrylic film into the pores of the substrate. Its low solid content of 20 to 23 percent and density of about 1.02 kg/L let it stay fluid enough to wet into surface capillaries rather than sit on top, so it consolidates loose fines and reduces the substrate’s suction. Once the water carrier evaporates, the acrylate binder leaves behind a continuous adhesion layer that is chemically compatible with the water-dispersed Sikagard topcoat applied over it. Crucially, the cured film remains water-vapour permeable, so trapped moisture in the concrete can still escape instead of building up behind the coating and causing blisters or delamination. This breathability is why it suits anti-carbonation systems, which are meant to block carbon dioxide and water while letting the slab dry outwards. Because it is a keying primer and not a barrier itself, only water-dispersed coatings should be used on top of it, and when it is used under a cement-based resurfacing mortar the mortar is placed while the primer is still tacky so the two bond wet-on-tacky.
Where it is used
- Priming concrete before water-based Sikagard protective and anti-carbonation topcoats such as Sikagard-550 W IN
- Adhesion promoter under cement-based resurfacing mortars during concrete repair
- Preparing fibre-cement boards and panels ahead of a protective coating
- Priming aerated concrete surfaces for uniform topcoat absorption
- Sealing gypsum surfaces and thin rendering mortars before overcoating
- Re-priming firmly adhering existing water-based coatings on hydrophobically impregnated concrete
- Surface preparation on building facades and external elevations
- Priming bridge, flyover and structural concrete as part of an IRC:SP:80 protection system
Key advantages
- Water dispersed and solvent free, giving low odour and easier use on occupied or enclosed sites
- Water-vapour permeable, so the substrate keeps breathing and moisture does not build up behind the coating
- Evens out substrate porosity so the protective topcoat cures at a consistent film build
- Part of a system that complies with IRC:SP:80, easing specification on Indian infrastructure
- Versatile across concrete, fibre cement, aerated concrete, gypsum and thin renderings
- Supplied ready to use, no site dilution or mixing required
- Applies by brush, roller or airless spray to suit different site conditions
- Environment friendly acrylate chemistry with a clean water clean-up before curing
Limitations & considerations
- Only water-dispersed coating systems may be applied over it; solvent-based topcoats need a different primer such as Sikagard-551 S Elastic
- It is a primer, not a standalone protective coating, and must be overcoated to give durable concrete protection
- New concrete must be at least 28 days old before priming
- Substrate tensile strength must exceed 1 N/mm2 and the surface must be dense and free of loose or friable particles
- Should not be applied if rain is expected during the minimum curing time
- Overcoating waiting time increases by roughly 100 percent when applied over an existing coating
Selection & best practice
Prepare the substrate first: it must be dense, sound and free of loose or friable particles, with a tensile strength above 1 N/mm2. On exposed concrete use steam cleaning, high-pressure water jetting or blast cleaning, and let new concrete reach at least 28 days. Over existing coatings, run adhesion pull-off tests and confirm the values before priming. Keep the ambient air and substrate between +8 and +40 degrees C, relative humidity at or below 80 percent, and both surface and air at least 3 degrees C above dew point. Shake the bucket thoroughly and apply as supplied, without diluting, in a single full-coverage coat by brush, roller or airless spray at roughly 0.120 to 0.200 kg/m2 depending on how absorbent the surface is. Respect the overcoating window before the topcoat: about 12 hours at +8 degrees C, 6 hours at +20 degrees C and 1.5 hours at +40 degrees C, and double those times over an existing coating. When it is used under a cement-based resurfacing mortar, place the mortar while the primer is still tacky, and wash all tools with clean water immediately after use since cured material comes off only mechanically.
Specifications
| Chemical base | Acrylic polymer (acrylate) dispersion, solvent free |
| Appearance / Colour | Milky white liquid |
| Packaging | 10 kg plastic bucket (ready to use) |
| Density | ~1.02 kg/L at +27 degrees C (EN ISO 2811-1) |
| Solid content by weight | 20-23 % |
| pH value | ~9 |
| Consumption | ~0.120-0.200 kg/m2 (~5-8 m2 per litre), substrate dependent |
| Application / substrate temperature | +8 degrees C min to +40 degrees C max |
| Shelf life / storage | 12 months from production; store sealed and dry at +5 to +35 degrees C, out of direct sunlight and frost |
Industry use cases
Infrastructure & Bridges
Priming pier, girder and deck concrete before a water-based anti-carbonation topcoat, as part of an IRC:SP:80-compliant protection system on flyovers and bridges.
Commercial Facades
Keying external concrete and rendered elevations of offices, malls and towers so the protective or decorative coating bonds evenly and stays low-odour during application on occupied sites.
Repair & Rehabilitation
Acting as the adhesion promoter under cement-based resurfacing mortars and beneath protective coatings during structural concrete repair and life-extension works.
Precast & Panel Systems
Preparing fibre-cement, aerated concrete and gypsum panels for a consistent, well-bonded protective coating on modern building envelopes.
Marine & Coastal Structures
Priming concrete in high-humidity coastal zones ahead of anti-carbonation coatings that must still let the slab breathe while resisting chloride-driven deterioration.
Frequently asked questions
Can Sikagard-552 IN Primer W be used on its own as a protective coating?
Which topcoats can go over it?
How much primer will I need per square metre?
How long before I can apply the topcoat?
How old must new concrete be before priming?
Does it need diluting or mixing on site?
How we position Sika Sikagard-552 IN Primer W
Sikagard-552 IN Primer W sits at the base of Sika’s water-based concrete protection system and is best specified alongside its intended topcoats, typically the Sikagard-550 W IN anti-carbonation coating, with Sikagard-720 EpoCem IN or Sika MonoTop-2500 Fair Finish used first where thin renderings need a levelling pore sealer. If the protective coating chosen is solvent based rather than water based, the correct primer is not this product but Sika’s silane-siloxane Sikagard-551 S Elastic. Space Arc also supplies equivalent systems from other brands we distribute, including Dr. Fixit and MC-Bauchemie protective-coating ranges, so the primer can be matched to whichever coating family a project specifies. Talk to our team to confirm the full build-up for your substrate and exposure conditions.
Fosroc Dekguard Primer — A specifier already standardising on the Fosroc Dekguard protective-coating system may prefer its matching silane-siloxane Dekguard Primer for a single-brand build-up, though note it is a different chemistry to this water-based acrylic primer.
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