Antipluviol W Water Repellent Sealer 10kg

Mapei Antipluviol W – Colourless Water Repellent Sealer for Brick, Masonry and Stone (10kg)

Mapei Antipluviol W is a ready-to-use, water-based silane and siloxane water-repellent impregnator designed to protect porous mineral building materials against driving rain and moisture penetration. Supplied as a milky aqueous emulsion, it penetrates absorbent substrates to create a colourless, breathable water-repellent treatment without forming a surface film.

Suitable for cementitious renders, cellular concrete, facing bricks, natural stone and artificial stone, Antipluviol W helps reduce water absorption while allowing the substrate to retain its natural appearance and breathability. It is particularly useful for protecting exposed external walls, restoring rain-exposed rendered surfaces and preserving historic buildings.

Antipluviol W is applied to dry, well-cured surfaces using a brush, roller or low-pressure spray equipment. Successive coats are applied wet-on-wet until the substrate is saturated, allowing the product to penetrate into the material.

Key Features and Benefits

• Silane and siloxane-based water-repellent impregnator
• Water-based formulation with 8% active substances
• Ready to use – no dilution required
• Deep penetration into porous and absorbent mineral substrates
• Helps protect external walls against driving rain and water absorption
• Colourless finish that does not form a visible surface coating
• Maintains the breathability of treated substrates
• Helps reduce moisture-related deterioration caused by rainwater penetration
• Very good water-droplet effect on suitable substrates
• Suitable for restoration and protection of historic buildings
• Can be applied by brush, roller or spray
• Supplied in a convenient 10kg plastic drum

Suitable Applications

• Water-repellent treatment of external masonry walls
• Protection of facing brickwork against driving rain
• Waterproofing protection for cementitious renders
• Water-repellent treatment of cellular concrete
• Protection of natural and artificial stone
• Restoration of rain-exposed rendered walls
• Preservation of historic and architecturally significant buildings
• Protection of porous mineral surfaces exposed to weathering

Suitable Substrates

• Facing bricks
• Conventional cementitious renders
• Cellular concrete
• Tuff stone
• Natural stone
• Artificial stone
• Cementitious smoothing layers
• Other suitable porous and absorbent mineral materials

Technical Specifications

• Manufacturer: MAPEI
• Product: Antipluviol W
• Product type: Water-repellent impregnator
• Composition: Silanes and siloxanes in aqueous emulsion
• Active substance content: 8%
• Consistency: Fluid liquid
• Appearance: Milky emulsion
• Colour after treatment: Colourless
• Density: Approximately 1.01g/cm³
• Application: Ready to use – do not dilute
• Application methods: Brush, roller or spray
• Application temperature: +5°C to +35°C
• Maximum relative humidity: 85%
• Surface drying time: Approximately 1–2 hours
• Typical consumption: 0.2–1kg/m², depending on substrate porosity
• Packaging: 10kg plastic drum
• Storage life: 24 months in original packaging
• Storage temperature: +5°C to +30°C

Typical Consumption Rates

Consumption depends on the absorbency and porosity of the substrate. MAPEI provides the following indicative application rates:

• Facing bricks: 0.50–0.75kg/m²
• Conventional render: 0.50–0.80kg/m²
• Tuff stone: 0.50–1.00kg/m²
• Cementitious smoothing layers: 0.20–0.40kg/m²
• Marble: 0.20–0.50kg/m²

These figures are indicative. A preliminary test is recommended to establish the quantity required to saturate the actual substrate.

Application Instructions

1. Substrate preparation

The surface must be dry, well cured, sound and sufficiently absorbent to allow deep penetration. Remove dirt, dust, grease, oil, paint, saline efflorescence, moss, weeds and any other material that could prevent the impregnator from penetrating the substrate.

2. Product preparation

Antipluviol W is supplied ready to use. Shake well before application. Do not dilute with water.

3. Application

Apply evenly using a brush or roller for smaller areas, or a suitable low-pressure backpack spray for larger surfaces. Apply successive coats using the wet-on-wet method, allowing each coat to be applied while the previous coat is still wet.

4. Saturation and finishing

Continue application until the substrate is fully saturated. On surfaces with lower absorbency, avoid allowing excess product to form surface layers. If necessary, remove excess material using a sponge float while the product is still wet.

5. Drying

The approximate surface drying time is 1–2 hours under suitable conditions. The penetration and durability of the water-repellent effect depend on substrate absorbency and the amount of product applied.

Important Application Limitations

• Apply only to dry, well-cured surfaces.
• Do not apply to damp substrates or surfaces affected by rising damp.
• Do not apply where the surface is exposed to direct sunlight during application.
• Do not apply below +5°C or above +35°C.
• Do not apply when relative humidity exceeds 85%.
• Do not apply when rain is imminent or in windy conditions.
• Carry out a preliminary test on natural stone, coloured renders and substrates with uneven absorbency to check for possible colour changes.
• After treatment, water-based products must not be used to paint over the surface.
• Not suitable for water tanks, lift shafts or surfaces subject to water pressure.
• Not suitable for gypsum surfaces or synthetic renders and synthetic-painted finishes.

Performance Information

MAPEI classifies Antipluviol W as Class III in accordance with EN 1062-3, with a capillary water absorption coefficient W24 below 0.1kg/(m²·h^0.5) on the specified tested substrates.

This classification indicates low water absorption through capillary action. Antipluviol W is a water-repellent surface treatment, not a tanking membrane or a substitute for structural waterproofing.

Frequently Asked Questions

What is Mapei Antipluviol W used for?

Antipluviol W is used to protect porous external building materials, including brickwork, cementitious renders and natural stone, against water absorption caused by driving rain.

Does Antipluviol W change the appearance of brickwork or stone?

It is designed to provide a colourless water-repellent treatment without forming a visible surface film. However, MAPEI recommends a preliminary test on natural stone, coloured renders and substrates with uneven absorbency to check for possible colour changes.

Can Antipluviol W be applied to damp walls?

No. The substrate must be dry and well cured. Moisture within the surface prevents the impregnator from penetrating deeply into the material.

How much Antipluviol W is needed per square metre?

Consumption generally ranges from 0.2–1kg/m², depending on substrate porosity. Facing bricks typically require 0.50–0.75kg/m², while conventional render typically requires 0.50–0.80kg/m².

How is Antipluviol W applied?

It can be applied by brush, roller or low-pressure spray. Apply successive coats wet-on-wet until the surface is saturated.

Can Antipluviol W be painted over?

After application, water-based products must not be used to paint over the treated surface. Confirm compatibility with MAPEI before applying any subsequent decorative coating.

Can Antipluviol W be used to treat rising damp?

No. Antipluviol W is designed to repel rainwater from absorbent external surfaces. It is not a treatment for rising damp, salt contamination or water penetration under hydrostatic pressure.

Order Mapei Antipluviol W from Clever Shield

Clever Shield supplies MAPEI Antipluviol W for contractors, builders, restoration specialists and property maintenance professionals throughout the UK.

For product enquiries, trade pricing or assistance selecting suitable MAPEI water-repellent treatments, contact our team.

Technical Downloads

Important: Clever Shield supplies products and materials only and does not design or specify waterproofing or building protection systems. Customers must establish product suitability for their particular project and follow the latest manufacturer technical data sheets, preparation instructions and safety information.