Water-based hydrophobic impregnation for porous roofs, walls, tiles and stone — soaks in colourless and stops water penetrating, the protective step after a Hipolava clean.
The jobs this product is specified for, day in day out.
Stops porous tiles drinking water after a biocidal clean.
Reduces water penetration without changing the look of the elevation.
The second half of the moss and algae treatment system.
What the data sheet actually gives you on site.
An impregnation, not a film — the building looks exactly as it did, just drier.
One application to saturation at 5–7 m² per litre. No build-up, no peeling.
Short weather window needed once the surface is prepared.
Water-based, against an EU limit of 140 g/L for the category.
The facts that matter, straight from the product data.
| Type | Aqueous hydrophobic impregnation for porous substrates |
| Finish | Colourless — milky liquid that dries invisible |
| Coverage | 5–7 m² per litre in a single coat, applied to saturation |
| Application | Brush or spray, ready to use — one coat to full saturation, never a thick film |
| Drying | 2–3 hours |
| Conditions | Above 10 °C, humidity under 80%, substrate 2–3 °C above dew point and not sun-hot |
| Prep | Dry, porous surface free of grease and dust — moss and algae removed first (Sollac Hipolava) |
| VOC | Max 1 g/L (EU limit for the category: 140 g/L) |
Everything from the manufacturer’s literature — open the part you need.
Deep-Penetrating Protection
A water-based, ready-to-use impregnation that penetrates into porous masonry and roof coverings to form a lasting hydrophobic barrier without changing the natural look of the surface.
Superior Water Resistance
Provides excellent waterproofing against driving rain, frost damage, efflorescence, and biological growth such as algae and moss.
Breathable & Invisible Finish
Unlike film-forming sealers, it allows full vapour permeability while drying to a completely clear, colourless finish—ideal for heritage brickwork, listed buildings, and conservation areas.
Keeps Masonry Dry
Reduces rain penetration into the outer leaf. Hidrollac WB is a hydrophobic treatment, not an insulant, and the manufacturer publishes no thermal performance data for it.
Easy Application
Ready-to-use liquid applied by brush or spray gun — the two methods the manufacturer publishes. A single saturating coat is sufficient, with drying achieved in 2–3 hours.
Single Saturating Coat
Applied in one coat to full substrate saturation. Additional coats do not improve performance and may cause surface whitening.
Low-VOC & Eco-Friendly
Water-based, non-film forming, and low in VOCs, making it safe to apply, environmentally responsible, and compliant with EU standards.
Sollac Hidrollac WB hydrophobic coating is suitable for a wide range of external building protection projects, including:
Brick and Masonry Façades – Protects porous walls from rain penetration while maintaining their natural look.
Heritage and Conservation Buildings – Ideal for listed properties and lime-based structures where breathability and invisible protection are essential.
Roof Coverings – Effective on porous clay tiles, slate, and concrete roof surfaces to prevent moisture absorption and frost damage.
Stone and Concrete Substrates – Provides long-term protection against weathering, staining, and algae growth.
Cavity and Solid Wall Protection – Reduces moisture ingress into the outer leaf of the wall build-up.
External Walls in Damp Climates – Perfect for exposed elevations subject to driving rain and high humidity.
Sollac Hidrollac WB hydrophobic coating is supplied ready-to-use and can be applied quickly and efficiently with standard equipment. For best results, surfaces must be clean, dry, and free from moss, algae, dust, oils, or efflorescence before treatment.
Brush Application – Suitable for small areas, detailed sections, or precision work around edges and joints.
Spray Gun (pistola) – One of the two application methods the manufacturer publishes, alongside brush. A roller is not a published method for this product.
Large façades and roof surfaces – Spray application gives full coverage and deep penetration into porous materials on larger areas.
Key Guidelines:
Apply in a single saturating coat until the surface is fully impregnated.
Avoid excessive build-up—Hidrollac WB is not a film-forming product.
Apply only when surface and air temperatures are above 10°C and at least 2–3°C above dew point.
Relative humidity should be below 80%.
Do not apply in direct sunlight or onto overheated surfaces.
Clean all tools and equipment with water immediately after use.
Sollac Hidrollac WB is a water-based hydrophobic impregnation. It penetrates into mineral substrates to create an invisible barrier that resists moisture ingress while allowing full vapour permeability. It is a water-repellent treatment, not an insulant, and we make no thermal performance claim for it.
Performance Characteristics:
Appearance: Milky liquid during application, dries to a completely clear and colourless finish.
Water Repellency: Excellent resistance against driving rain and surface water absorption.
Vapour Permeability: High – maintains breathability of walls and roofs, preventing trapped moisture.
Coverage: 5–7 m² per litre per coat (surface-dependent).
Drying Time: 2–3 hours at normal ambient conditions.
VOC Content: max. 1 g/L – water-based and very low VOC (EU Category A/i limit is 140 g/L).
Service Temperature Range: Suitable for application between 10°C and 35°C; substrate should be 2–3°C above dew point.
Packaging: Supplied in 1 L, 5 L, and 20 L containers.
Hidrollac WB is a hydrophobic impregnation. It is not an insulant and no thermal performance figure is published for it; any insulation or U-value benefit must come from the insulation specification, not from this treatment.
5 to 7 m² per litre, applied in one saturating coat until the substrate is fully impregnated. The rate varies with the nature and condition of the surface. Pack sizes are 1 L, 5 L and 20 L, so a 5 litre container treats roughly 25–35 m². Source: Ficha Técnica Hidrollac WB, REF 410.0134, rev. 2025.08.
Hidrollac WB is made in Portugal by NEWGER – Fabrico e Comércio de Tintas, Rep, Lda., trading as Sollac Tintas, of Torres Vedras.
This listing is the water-based variant, Hidrollac WB. A separate solvent-based Hidrollac exists; the manufacturer publishes no coverage rate for it. If you need the solvent-based grade, call 01208 832 602.
Correct surface preparation is essential to ensure the long-term performance of Sollac Hidrollac WB hydrophobic coating. All substrates must be:
Dry and Porous – Surfaces should be fully dry before application to allow deep penetration.
Clean and Contaminant-Free – Remove all traces of dirt, dust, oils, grease, or efflorescence.
Free from Biological Growth – Any moss, algae, or lichen should be removed by brushing or pressure washing. For best results, substrates can be treated with Hipolava Biocidal Cleaner to eliminate biological growth and inhibit future regrowth.
Sound and Stable – Repair cracks, defective mortar joints, or friable areas before treatment.
Uncoated – Do not apply over painted, sealed, or previously coated surfaces, as this will restrict penetration.
Once prepared, allow the substrate to dry fully before applying Hidrollac WB. Using Hipolava Biocidal Cleaner during preparation helps ensure maximum absorption, durability, and long-term effectiveness of the hydrophobic barrier.
While Sollac Hidrollac WB hydrophobic coating provides excellent water-repellent and thermal performance, it should be applied with consideration of the following limitations:
Not a Film-Forming Coating – The product penetrates substrates and does not create a surface film. It will not bridge cracks, voids, or structural defects.
Substrate Suitability – Designed for porous mineral substrates such as brick, masonry, stone, concrete, and porous roof coverings. It is not suitable for sealed, painted, or non-porous surfaces.
Single-Coat System – Additional coats will not enhance performance and may lead to surface whitening or reduced vapour permeability.
Application Conditions – Do not apply in temperatures below 10°C, in high humidity (>80%), during rainfall, or onto surfaces that are overheated from direct sunlight.
Colour Variations – While the product dries clear, very dark or highly absorbent substrates may show temporary darkening during curing.
Maintenance of Treated Surfaces – Effectiveness can be reduced by accumulation of dirt, surface coatings, or biological growth. Periodic cleaning may be required to maintain performance.
Not a Substitute for Repairs – Structural cracks, defective pointing, or major water ingress issues must be corrected before application.
Environmental Precautions – Avoid release into drains, waterways, or soil. The product is harmful to aquatic life with long-lasting effects.
Packaging Formats: Supplied in durable 1 L, 5 L, and 20 L containers suitable for professional and commercial use.
Shelf Life: Up to 12 months when stored correctly in unopened containers.
Storage Conditions:
Store in a cool, dry, and well-ventilated area.
Keep containers tightly sealed when not in use.
Protect from frost and do not expose to extreme temperatures. Recommended storage range: 5°C to 30°C.
Keep away from direct sunlight, heat sources, and incompatible materials such as strong acids or alkalis.
Handling Precautions: Always store upright to prevent leakage and ensure container integrity.
Proper storage extends product stability and ensures consistent performance when applied.
Sollac Hidrollac WB hydrophobic coating is manufactured to strict quality standards to ensure consistency, safety, and regulatory compliance.
VOC Compliance: Very low VOC content (max. 1 g/L, against an EU Category A/i limit of 140 g/L) – fully compliant with EU Directive 2004/42/EC on the limitation of emissions of volatile organic compounds.
REACH & CLP Regulations: Formulated in accordance with the European REACH Regulation (EC) No. 1907/2006 and CLP Regulation (EC) No. 1272/2008 for classification, labelling, and packaging.
Environmental Responsibility: Classified as water-based and non-film forming, reducing environmental impact while maintaining high performance.
Quality Assurance: Produced under certified quality management systems, ensuring each batch meets strict performance specifications.
By meeting recognised European standards for safety and performance, Hidrollac WB provides specifiers, contractors, and building owners with confidence in both application and long-term results.
Sollac Hidrollac WB hydrophobic coating is a water-based, low-VOC formulation that is safe to handle when used correctly. However, as with all chemical treatments, suitable precautions must be observed during storage, preparation, and application.
Personal Protective Equipment (PPE):
Wear protective gloves, overalls, and suitable footwear to avoid skin contact.
Use safety goggles or face protection to prevent accidental splashes to the eyes.
A protective mask is recommended when applying by spray in enclosed or poorly ventilated areas.
Safe Handling Guidelines:
Apply only in well-ventilated environments.
Avoid contact with skin and eyes; wash thoroughly with clean water if accidental contact occurs.
Do not eat, drink, or smoke during application.
Keep containers sealed when not in use.
Environmental Precautions:
Do not discharge into drains, watercourses, or soil.
Prevent accidental spillages by storing and handling carefully.
Dispose of all residues, tools, and empty containers in accordance with local waste regulations.
First Aid Measures:
Skin Contact: Wash immediately with soap and water; remove contaminated clothing.
Eye Contact: Rinse cautiously with clean water for several minutes; seek medical attention if irritation persists.
Inhalation: Move to fresh air if discomfort occurs.
Ingestion: Do not induce vomiting; seek immediate medical advice and present product container or label.
By following these safety measures, applicators can ensure the safe and effective use of Hidrollac WB while protecting both themselves and the environment.
Single-Coat System: Sollac Hidrollac WB hydrophobic coating is designed for application in one saturating coat. Additional coats will not improve performance and may lead to surface whitening.
Substrate Moisture: Ensure all substrates are fully dry before application. Applying to damp or wet surfaces will restrict penetration and reduce effectiveness.
Curing Time: While touch-dry in 2–3 hours, allow treated surfaces at least 24 hours to fully cure before exposure to rainfall.
Not for Structural Repairs: This product will not fill cracks or voids and should not be used as a substitute for repair mortars or remedial waterproofing systems.
Colour and Appearance: The coating dries to a clear, colourless finish. Temporary darkening may occur on highly absorbent substrates during curing but will fade as the surface dries.
Maintenance: Periodic cleaning may be required to maintain performance, especially in shaded or damp areas prone to biological growth.
Compatibility: Not suitable for application over painted, sealed, glazed, or non-porous surfaces.
Professional Use Recommended: For best results, application should be carried out by trained contractors familiar with hydrophobic coating systems.
These products are designed to work together — buying the full system is what qualifies the warranty.
Tell us about the building and we’ll spec the job free — the right system, the right quantities, and trade rates if you’re buying for a contract.
Tell us about your building and we’ll recommend the right system — foam, waterproofing or both — surveyed, specified and quoted at no cost.
