What is WA 98 used for?

WA 98 is a water-based contact adhesive specifically designed for bonding ARDEX sheet membranes and PVC sheet products to primed substrates. It is not a general-purpose construction adhesive.

Does WA 98 need to be applied to both surfaces?

Yes. Apply a thin even coat to both the substrate and the back of the sheet membrane, allow to flash off until tacky, then bond under firm pressure for permanent adhesion.

What's the coverage rate?

Coverage is approximately 4-8 m² per litre depending on substrate porosity, applied to both bonding surfaces.

Is WA 98 solvent-free?

Yes. WA 98 is water-based with no solvent hazard, making it safe to use in occupied buildings and well-ventilated indoor spaces.

Can WA 98 bond non-ARDEX membranes?

WA 98 is engineered specifically for ARDEX sheet membrane systems. For other products, refer to the membrane manufacturer's approved adhesive list.

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Ardex WA 98 Adhesive

Name: Ardex WA 98 Adhesive
Brand: Ardex
SKU: AARA32
Price: 407.95 AUD
Availability: InStock

$407.95

or 4 interest-free payments with

ARDEX WA 98 Adhesive is a high-performance membrane contact adhesive designed for use with ARDEX sheet applied membranes. It offers exceptional performance and adheres effectively to a wide range of substrates. This adhesive provides versatility in application methods, allowing for brushing, rolling, or spray application. Its extended tack life further enhances its usability, making it an excellent choice for large external areas.

Extended tack time makes it ideal for large external areas

Brush, roller, air driven or airless spray applied

Used with ARDEX Weldtec, Butynol and WPM 116 sheet membranes

Quantity: 1

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Ardex WA 98 Adhesive

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517

Product Details

Key features of ARDEX WA 98 Adhesive include:

High performance: Delivers reliable adhesion for ARDEX sheet applied membranes.

Versatile application: Can be brush, rolled, or spray applied, offering flexibility in installation.

Extended tack life: Allows for convenient handling and application, even in large external areas.

Superior bonding: Ensures a strong and long-lasting bond to various substrates.

Specially developed: Tailored specifically for ARDEX sheet applied membranes, providing optimal compatibility and performance.

How to Use

Apply to both the sheet membrane underside and the substrate by brush, roller or spray at 4m2 - 8m2/litre and bed the membrane once the adhesive is tacky to touchConfirm the application is external - WA 98 must be used for external applications only
Mechanically prepare and vacuum clean the substrate, removing all dirt, dust, curing compounds, oils, grease, surface sealers and other contaminants
Check substrate moisture: where concrete or masonry exceeds 80% relative humidity (ASTM F2170) or 15g/m2/24hrs (ASTM F1869), ARDEX WPM 300 HydrEpoxy must be the nominated primer
Where WPM 300 is required, apply two coats at 3 m2 per litre per coat and allow a minimum of 24 hours drying before continuing
Confirm the WPM 300 has fully cured, since applying WA 98 over uncured WPM 300 will noticeably damage it
Shake and stir the unopened drum to thoroughly mix the contents before use
On extremely porous substrates, apply a first coat thinned up to 50% with ARDEX WA 98 Solvent and let it dry, then a second neat coat
For optimum adhesion, apply a neat primer coat of WA 98 to the prepared substrate and allow it to totally dry
Apply a neat coat of WA 98 to the primed substrate and to the underside of the sheet membrane at 4m2 - 8m2 per litre by brush, roller, air driven or airless spray
Apply at a substrate and ambient temperature between 10C and 35C
Allow approximately the same drying time to both faces, generally 15 - 20 minutes depending on substrate temperature and ambient conditions
Bed the membrane only once the adhesive is tacky to touch - embedding too early can trap solvent and bubble the sheet
Reapply the adhesive if the tack time elapses
Do not leave the adhesive UV exposed for long periods
Clean all equipment with ARDEX WA 98 Solvent before the product dries

Technical Specifications

Type: Solvent-based contact adhesive
Composition: Polychloroprene (Neoprene)
Colour: Red
Reactivation Method: Solvent wipe or heat
Viscosity: 130 plus or minus 20cP at 25C
Application Temperature: 10C to 35C substrate and or ambient
Service Temperature: -20C to 92C
Working Time: 15 - 60 minutes, temperature dependent
Peel Strength, membrane to plywood: 30 - 35N (Butyl); 7 - 10N (EPDM) (ASTM D903)
Drying Time Before Bedding: generally 15 - 20 minutes, varies with substrate temperature and ambient air conditions
Coverage: 4 m2 - 8 m2 per litre (approximately), per coated surface
Use: External applications only
Thinning: ARDEX WA 98 Solvent, up to 50% for the first coat on extremely porous substrates, or to reduce viscosity for spray
Packaging: 20L drum
Shelf Life: 12 months in the original unopened packaging, in a dry place at 23C and 50% relative humidity, stored vertically out of direct sunlight and away from ignition sources
Hazard Classification: Hazardous chemical, dangerous goods, Poisons Schedule S5; highly flammable liquid and vapour

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Ardex WA 98 Adhesive

$407.95

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Technical overview

ARDEX WA 98 Adhesive is a ready to use solvent-based external contact adhesive developed for bonding selected ARDEX sheet applied membranes, specifically ARDEX Weldtec Membranes, ARDEX Butynol Membranes and ARDEX WPM 116. It is a red polychloroprene adhesive that can be brush, roller, air driven or airless spray applied, and its extended tack life makes it suited to large external areas. It is applied to both the sheet membrane underside and the substrate at 4 m2 - 8 m2 per litre and the membrane is bedded once the adhesive is tacky to touch. Peel strength is quoted to ASTM D903. The data sheet claims no Australian Standard classification and publishes no accredited test report number.

Key applications

Bonding ARDEX Weldtec Membranes
Bonding ARDEX Butynol Membranes
Bonding ARDEX WPM 116
Bonding selected ARDEX sheet applied membranes to concrete, screed, brick, CFC sheet and timber
Large external areas where an extended tack time is needed
Priming extremely porous substrates when thinned with ARDEX WA 98 Solvent
Bonding over cured ARDEX WPM 300 HydrEpoxy on damp or green concrete

Surface suitability

Concrete (mechanically prepared and vacuum cleaned, free of dirt, dust, curing compounds, oils, grease and surface sealers)
Screed
Brick
CFC sheet
Timber
Some PVC type (contact ARDEX Technical Services for other substrates)
Damp or green concrete and masonry above 80% relative humidity (ASTM F2170) or 15g/m2/24hrs (ASTM F1869), primed with two coats of ARDEX WPM 300 HydrEpoxy at 3 m2 per litre per coat and cured a minimum of 24 hours
Extremely porous substrates (first coat thinned up to 50% with ARDEX WA 98 Solvent, second coat neat)

ARDEX WA 98 Adhesive must be used for external applications only. It is a highly flammable liquid and vapour and must be used only in well ventilated areas: keep away from naked flames, electrical appliances and lights, lighted cigarettes and any other ignition source, and keep the lid tightly on when not in use. It is not to be left UV exposed for long periods of time. High substrate moisture content will negatively affect product adhesion, drying and curing performance, and where concrete or masonry moisture exceeds 80% relative humidity (ASTM F2170) or 15g/m2/24hrs (ASTM F1869), ARDEX WPM 300 HydrEpoxy must be the nominated primer. Embedding the sheet membrane too early may result in solvent entrapment causing sheet membrane bubbling. Applying WA 98 over uncured ARDEX WPM 300 will noticeably damage the WPM 300. Apply only between 10C and 35C. Classified a hazardous chemical and dangerous goods on Poisons Schedule S5: highly flammable liquid and vapour, harmful if swallowed, may be fatal if swallowed and enters airways, causes skin irritation and serious eye irritation, may cause drowsiness or dizziness, suspected of damaging fertility and the unborn child, may cause damage to organs through prolonged or repeated exposure, and toxic to aquatic life with long lasting effects.

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Technical Specifications

Type	Solvent-based contact adhesive
Composition	Polychloroprene (Neoprene)
Colour	Red
Reactivation Method	Solvent wipe or heat
Viscosity	130 plus or minus 20cP at 25C
Application Temperature	10C to 35C substrate and or ambient
Service Temperature	-20C to 92C
Working Time	15 - 60 minutes, temperature dependent
Peel Strength, membrane to plywood	30 - 35N (Butyl); 7 - 10N (EPDM) (ASTM D903)
Drying Time Before Bedding	generally 15 - 20 minutes, varies with substrate temperature and ambient air conditions
Coverage	4 m2 - 8 m2 per litre (approximately), per coated surface
Use	External applications only
Thinning	ARDEX WA 98 Solvent, up to 50% for the first coat on extremely porous substrates, or to reduce viscosity for spray
Packaging	20L drum
Shelf Life	12 months in the original unopened packaging, in a dry place at 23C and 50% relative humidity, stored vertically out of direct sunlight and away from ignition sources
Hazard Classification	Hazardous chemical, dangerous goods, Poisons Schedule S5; highly flammable liquid and vapour

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Frequently asked questions

View all FAQs

What is WA 98 used for?

Compatibility
WA 98 is a water-based contact adhesive specifically designed for bonding ARDEX sheet membranes and PVC sheet products to primed substrates. It is not a general-purpose construction adhesive.
Does WA 98 need to be applied to both surfaces?

Installation
Yes. Apply a thin even coat to both the substrate and the back of the sheet membrane, allow to flash off until tacky, then bond under firm pressure for permanent adhesion.
What's the coverage rate?

Performance
Coverage is approximately 4-8 m² per litre depending on substrate porosity, applied to both bonding surfaces.
Is WA 98 solvent-free?

Compliance
Yes. WA 98 is water-based with no solvent hazard, making it safe to use in occupied buildings and well-ventilated indoor spaces.
Can WA 98 bond non-ARDEX membranes?

Compatibility
WA 98 is engineered specifically for ARDEX sheet membrane systems. For other products, refer to the membrane manufacturer's approved adhesive list.

Why trade professionals choose Ardex

Ardex is a global leader in high-performance building products, trusted by Australian trade professionals. The range spans liquid and sheet waterproofing membranes, primers, sealers, screeds and repair systems, engineered for lasting results on residential and commercial projects.

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