WPU Class III Liquid Waterproofing Membrane

RLA WPU is an elastomeric one part polyurethane/Acrylic fibre reinforced water based membrane developed as a high performance internal/ external membrane for most general waterproofing applications. It is suitable for external applications where a UV stable, occasional trafficable membrane is required.


  • 12 months shelf life in unopened containers
  • Tough flexible film when cured
  • Class III membrane certified to ASTM 4858:2004 wet area membranes when applied in accordance to AS3740:2010
  • Tested in Accordance to AS4654.1 2012 for suitability for external use
  • Low VOC content
  • Single pack no mixing
  • Excellent adhesion to a wide variety of substrates
  • Safe and easy to use
  • UV stable for external applications
  • Can handle light maintenance traffic once fully cured

For use in commercial, residential buildings in internal / external wet areas such as bathrooms, kitchens, laundry’s, balconies, decks, roofs or any such area that will be tiled / covered with an appropriate finish. Areas left exposed as a UV resistant membrane finish to suitably graded surfaces prepared with adequate falls to minimise ponded water, and allow water shedding to drains.

Acceptable Substrates:
Concrete after curing period of 28 days
Masonry / render after curing period of at least 7 days cement sheeting / underlay / external weatherboard / blue board/ Pre-cast concrete once release agent has been removed/ dissipated
Wet area plasterboard / Villaboard / Structural Plywood Type A (PAA JAS-ANZ) / Brickwork, Hebel (aggregate block)