Original price was: $150.00.$135.00Current price is: $135.00.
WPA 400 is a high-performance, water-based undertile waterproofing membrane designed for bathrooms, balconies, laundries, and wet areas. Fibre-reinforced and elastomeric, it delivers excellent adhesion, flexibility, and durability while meeting AS/NZS waterproofing standard.
Available in 15L GREY.
Coverage: 10M2.
10 in stock (can be backordered)
Greater Sydney! Order by 12pm, get it delivered same day.
Free 2-3 Days Delivery for Purchases over $350.
South Coast, Central Coast & Blue Mountains delivered overnight*.
Orders:
-Online Checkout
-Order Via Email
-Order Via Phone
-Store Pick Up
Payments:
-All major Credit Cards
-Google Pay
-Apple Pay
-Send you Invoice*
-(COD)Cash on Delivery*
** Invoices & Cash on delivery via emails only.
Dry porous substrates must be primed with WPA 360 waterbased or WPA SB solvent-based primers. Damp substrates with a RH of <75% must be primed with WPA 460 two-part epoxy primer.
Substrates with an RH >75% must be primer with WPA 560 Moisture Seal.
Lightweight structural fibre cement sheeting must be primed with WPA 460 two-part epoxy primer or WPA 560 Moisture Seal. Non-porous substrates, such as metals or PVC must be primed with WPA 160 Non-Porous primer.
WPA 400 is an elastomeric, fibre-reinforced waterproofing membrane formulated with advanced polymer technology. Engineered for under-tile waterproofing, it provides superior adhesion, flexibility, and extremely low vapour transmission, making it ideal for both residential and commercial projects.
WPA 400 is fully compatible with polymer-modified cement-based tile adhesives, screeds, and renders, ensuring seamless integration into tiling systems. With fast drying times, low VOC content, and permanent flexibility, WPA 400 is the professional’s choice for reliable waterproofing.
Bathrooms & showers
Laundries & wet rooms
Balconies, decks & podiums
Any internal or external area to be tiled with ceramic or stone
✅ Class III Membrane (AS/NZS 4858) & Class II (AS 4654.1) – tested and compliant
✅ Fibre-reinforced for enhanced strength & crack bridging
✅ Excellent adhesion to a wide range of substrates
✅ Resistant to re-emulsification once fully cured
✅ Fast drying for quicker project turnaround
✅ Extremely low VOC – safe for internal applications
✅ Permanently flexible – accommodates structural movement
✅ Compatible with most tile adhesives and construction systems
Do not apply WPA 400:
• Over damp, wet or contaminated substrates
• If it is raining or if rain is imminent
• Directly over any existing coatings
• As an exposed membrane
• As a high wear surface for foot or vehicle traffic
• Where ambient or surface temperatures are below10°C or greater than 35°C.
• To areas subject to negative hydrostatic pressure or rising damp
• To areas of continuous immersion such as swimming pools, ponds, water features or water tanks
To reduce the possibility of surface contamination, it is
recommended that tiling be carried out as soon as the
membrane has cured.
