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Ardex WPM 405 - 20L

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Ardex WPM 405 - 20L 

Polymer Additive for Cement and Concrete Mixes (Sheltercrete Additive)

ARDEX WPM 405 is an SBR, multipurpose, concentrated liquid polymer additive which when used with sand/cement greatly improves the bond strength and flexibility.

  • Water resistant – can be used as a temporary waterproofing sealer on rooftops
  • High strength – can be used as an admix for render/screeds
  • Water based – safe to use and low odour
  • Green Star – meets the benchmark for VOC credit in the Green Building Council of Australia’s Rating Tool
  • Surfaces (not wet) and can be rendered or painted over

Concrete, renders, brickwork, screeds, masonry, AAC blocks, fibre cement sheets (external grade only).

Technical Data ARDEX WPM 405

Temporary waterproofing sealer in high exposure areas such as rooftops. Slurry coat prior to applying renders or toppings.
Admix for sand/cement mixes especially in repair mortars, fillets, covings renders and screeds.


  • White liquid


  • Temp waterproofing – 12m2 (2 coats)
  • Slurry coat – 3m2/L
  • Render – 2m2/L

Pack Size:

  • 20L pail

Drying Times:

  • Recoat time: 16 hrs (for temp waterproofing/screeds)
  • Full cure: 24 hrs

VOC content:

  • 32g/L

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