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UV Stable Polyurethane Liquid Membrane:  

WPA 992 UV is a thixotropic, one part, liquid applied, moisture cured polyurethane waterproofing membrane, suitable for waterproofing most applications. WPA 992  UV cures to form a UV stable, seamless, tough, durable, elastomeric waterproofing membrane. WPA 992 UV has excellent adhesion to most suitably primed building  substrates and is suitable for above and below ground applications.  

Recommended for:

  • Retaining Walls
  • Planter Boxes
  • Internal wet areas, balconies and decks
  • Rooftops
  • Exposed applications 


  • Class III membrane in accordance with AS 4858 and AS 4654.1
  • Fast curing
  • UV Stable
  • Tar and Bitumen free
  • Permanently flexible
  • Good Chemical resistance
  • Excellent adhesion to a wide variety of substrates
  • Single pack 


WPA 992 UV is suitable for concrete, render, screeds, block work, fibre-cement sheeting, wet area grade plasterboard, PAA certified structural and marine plywood and Scyon*  sheeting. Metal surfaces must be primed with an appropriate metal etch primer. Always contact the manufacturer if there is any doubt about the suitability of substrates.  *Must be primed with WPA 460 or WPA 560 two-part waterbased epoxy.  


All surfaces to be waterproofed must be firm, clean, dry, sound and smooth. All laitance, grease, oil, wax, curing compounds, loose material, paint and any other contaminants which may reduce or prevent adhesion must

be mechanically removed. Masonry surfaces must be pointed flush and surface defects repaired. New concrete must be cured for minimum 28 days. Damp concrete must be allowed to thoroughly dry or primed with WPA 460 or WPA 560 two-part water-based epoxy. Render and cement screeds must be cured for minimum 7 days. Damp concrete, render or screeds must be allowed to thoroughly dry or primed with WPA 460 or WPA 560 two part water based epoxy. Fibre cement sheeting, water resistant plasterboard, PAA structural and marine plywood and Scyon sheeting must be installed in accordance with the manufacturers’ installation requirements.

Install a bond breaker/fillet using WPA FC at all horizontal and vertical transitions. For optimal performance, incorporate WPA Elastoband at all transitions.  

Static Crack Treatment

For static cracks less than 1mm, clean cracks thoroughly before filling with a WPA FC. WPA 992 UV cannot span gaps. For dynamic cracks/expansion joints and control joints, the use of WPA Elastoband system is recommended. Contact the Bayset Technical Department for further advice.  


Porous substrates must first be primed using WPA SB solvent based primer, WPA 460 or WPA 560. Damp substrates, Scyon sheeting and dense substrates must be primed using WPA 460 or WPA 560 two part epoxy primer. Non-porous surfaces should be primed with an appropriate non-porous primer. Apply the primer to the prepared substrate by using a brush or roller. Allow the primer to fully dry prior to applying the waterproofing membrane.  


Prior to application, stir the contents thoroughly. Using a brush or roller, apply the first coat of WPA 992 UV after the primer has sufficiently dried. Apply an even and consistent coat of approximately 0.75mm wet film thickness. Once the first coat has dried, apply a second coat of WPA 992 UV at right angles to the first coat. Apply an even and consistent coat of approximately 0.75mm wet film thickness.

WPA 992 UV must be applied with a minimum of two coats to achieve a dry film thickness of not less than 1.2mm (1200 microns). Test the depth of coats with a wet film thickness gauge at regular intervals during installation.

WPA 992 UV must be installed in strict accordance with AS3740 for internal wet areas and AS4654.2 for external areas. Slip resistance may be enhanced by applying a third coat of WPA 992 UV and broadcasting graded sand while this coat is still wet.

Note: Avoid contact with skin and eyes. Wear splash proof goggles and rubber or PVC gloves at all times  

Performance Data and Physical Properties @23oC & 55% RH

  • Colour: Grey
  • Viscosity (cps): 2500-4000
  • Specific Gravity (gr/cm3): 1.4
  • Flash Point oC: >42
  • Tack free Time (hrs): 2
  • Recoat Time (hrs): 4
  • Cure Time (hrs): 24
  • Shore A Hardness: 70
  • Elongation (%): >300 


  • Do not apply WPA 992 UV:
  • Over damp, wet or contaminated substrates.
  • If it is raining or if rain is imminent.
  • Directly over any existing coatings.
  • Directly to particle board flooring. (Ceramic tile underlay must be installed);
  • As a wearing surface for foot or vehicle traffic.
  • In swimming pools.
  • Where the surface temperature is below 10oC or greater than 35oC.
  • To areas subject to negative hydrostatic pressure or rising damp. 

Clean Up

Avoid spills. Equipment should be immediately cleaned with Xylene Solvent. Clean skin and hands using Aftek Handy Wipes.  


WPA 992 UV is available in 15 litre pails.  


1.5 litres per m2 at 1.2mm dry film thickness (10sqm per drum).

The coverage figures are theoretical due to wastage and depending on the porosity and profile of the substrate,

coverage figures may be reduced.  

Shelf Life

Unopened pails can be stored for up to 6 months in a cool, dry and weatherproof environment. If stored at high temperatures, the shelf life may be reduced  

Clean up

Avoid spills. Equipment should be immediately cleaned with Xylene Solvent.  


WPA 990PU is available in 15 litre pails.  


1.5-2.0 litres per m2 at 1.2mm dry film thickness (8-10m2 per drum).  The coverage figures are theoretical due to wastage and depending on the porosity and profile of the substrate, coverage figures may be reduced.  

Shelf life

Unopened pails can be stored for up to 6 months in a cool,  dry and weatherproof environment.  If stored at high temperatures, the shelf life may be reduced.  

First aid

If poisoning occurs, contact a doctor or Poisons Information Centre (Phone Australia 131 126).


If inhaled, unlikely due to viscosity of the product, remove person to fresh air and apply artificial respiration if required and seek urgent medical attention. Product is flammable when wet. Keep away from all sources of ignition. Ensure adequate ventilation. Vapours may collect in low lying  areas.  

Skin contact

If on skin, remove contaminated clothing and wash skin with soap and water. This may not remove the product but will encourage it to cure and it can later be peeled off.

Eye contact

If in eyes, flush thoroughly with clean water, holding lid open to ensure any trapped product may be flushed away. Seek medical assistance.


If swallowed do not induce vomiting, give plenty of water to drink. Seek urgent medical advice.

Notes to Physician

Treat symptomatically.


Avoid spills. They are difficult to clean particularly off porous surfaces. On concrete and non-porous surfaces use a cloth and Xylene for wet spills. Do not clean off carpets as it is better to allow product to cure and then shave the carpet.

Prevent from entering drains or waterways.  


The information provided in this technical bulletin is as correct in detail as possible and is intended to give a fair description of the product and its capabilities. In practice, the substrate and environmental conditions vary widely, making it essential for the user to determine the product’s suitability for a particular application and that the product is not used beyond its physical limitations. The product is guaranteed providing it is applied in accordance with the manufacturer’s instructions as stated in this data sheet and any relevant Standard or Code, and provided the building and installation is structurally sound.  


The technical information and application advice given in this Waterproofing Products Australia publication is based on the present state of our best scientific and practical knowledge. As the information contained herein is of a general nature, no assumption can be made as to a product's suitability for a particular use or application and no warranty as to its accuracy, reliability or completeness, either expressed or implied, is given other than those required by law. The user is responsible for checking the suitability of products for their intended use


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