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ARDEX MULTIPRIME 4L water-based primer for internal & external walls, white jug
ARDEX MULTIPRIME 4L water-based primer for internal & external walls, white jug
ARDEX MULTIPRIME 4L water-based primer for internal & external walls, white jug
ARDEX MULTIPRIME 4L water-based primer for internal & external walls, white jug

Ardex Multiprime Primer

A water-based primer for porous concrete, masonry, fibre-cement sheet and prepared plasterboard. Helps create a consistent bonding surface for compatible ARDEX systems.

Vendor: Ardex
SKU: PRIMEARDMULTI/20
Availability: Out Of Stock
$301.48
$301.48
Prices do not include GST

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This item is supplied to order and is not confirmed as in stock at any store. For availability before visiting, email contact@adheseal.com.au.

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Flat-rate shipping $17.95 + GST (metro and standard zones). Excludes remote/regional/high-cost postcodes and certain items (DG, oversized, long-length, or bagged products 15 kg+). If your order includes any of these, we will contact you to arrange additional freight charges. Online purchases only.

Download Product Data

Download TDS Download SDS Download Ardex Multiprime VOC Certificate
Description  

ARDEX Multiprime is a quick-drying water-based primer for porous building substrates. It helps compatible ARDEX waterproofing, tiling and construction products bond consistently to prepared concrete, cement render, screeds, masonry, lightweight concrete blocks and fibre-cement sheet.

Why choose Multiprime?

Porous substrates can absorb water unevenly and compromise the performance of subsequent layers. Multiprime helps prepare these surfaces with a consistent primed base. Its water-based formulation avoids the solvent hazard associated with solvent-based primers, making it practical for internal and external wall and floor preparation.

Where to use it

  • Concrete and cementitious screeds before an approved ARDEX system.
  • Masonry and lightweight concrete blocks with high surface suction.
  • Fibre-cement sheet and other porous substrates expressly compatible with the specified membrane or adhesive.

Coverage and pack sizes

ARDEX lists typical coverage of approximately 6m² per litre, depending on substrate porosity and application method. Available manufacturer pack sizes include 1L, 4L and 20L. Estimate requirements from the substrate and the actual pack size selected.

Important limitations

Multiprime is for suitable porous substrates, not a universal primer for glazed tiles, metal or other dense non-porous surfaces. Confirm that it is an approved primer for the membrane, leveller or adhesive being installed. Damp or contaminated substrates may require a different preparation or moisture-control system. Allow the primer to dry as required before applying the next product.

Common Questions  

What is ARDEX Multiprime used for?
It primes porous substrates before approved ARDEX adhesives, levellers and waterproofing products.

What coverage should I allow?
Approximately 6m² per litre.

Can it be used outside?
Yes, in suitable ARDEX internal and external systems.

Can I use it on any substrate?
No. Use the substrates listed in the current TDS or confirm other surfaces with ARDEX Technical Services.

Uses & Benefits  
Quick-drying water-based primer for porous substrates before approved ARDEX products. Suitable for internal and external walls and floors. Improves adhesion without a solvent-based primer. Typical coverage is about 6m² per litre. Suitable for concrete, render, screed, masonry, fibre-cement sheet and lightweight concrete blocks.
How To Apply  
Mechanically prepare and vacuum the substrate where required. Remove dust, curing compounds, oils, grease, sealers, coatings and other contaminants. Apply an even coat of ARDEX Multiprime to the porous substrate using a suitable brush or roller. Allow approximately 6m² per litre as a guide. Allow the primer to dry before applying the approved ARDEX subsequent product.
Limitations and Safety Info  
Use only on substrates approved by the current ARDEX TDS. Remove dirt, dust, curing compounds, oils, grease, sealers and existing coatings before application. Apply to a sound, clean and dry substrate. For substrates outside the stated list, confirm suitability with ARDEX Technical Services.
Suitable Substrates  
  • Concrete.
  • Render and screed.
  • Masonry and concrete blocks.
  • Autoclaved aerated concrete.
  • Fibre-cement sheet.
  • Jointing compound over plasterboard.

Ardex Multiprime Primer Physical Properties

Ardex Multiprime Primer Physical Properties
Property Value
Form Liquid
Shore A Hardness 90
Specific Gravity 1.19 g/cm³
Service Temperature 0ºC - 80ºC
Tensile Strength 5.03 MPa
Full Cure 15 - 30 minutes (@ 23ºC / 50% R.H)
Coverage 8m² - 9m² per 15L pail (two coat application)
pH 8.0
Initial Boiling Point 100 °C
Vapour Pressure 2.26 kPa @ 20C
Solubility in Water Partly miscible
Vapour Density (Air = 1) <1

Ardex Multiprime Primer - Use Cases

Here are some common examples on where Ardex Multiprime Primer used by our customers.

Tiling

Enhance porous substrate adhesion

When needing to improve adhesion on concrete, screed, or masonry surfaces for approved ARDEX levelling compounds or adhesives.

Seals surfaces and consolidates dusty substrates, preventing suction and ensuring a consistent, strong bond for subsequent ARDEX applications.

  • Concrete, screed, render
  • Masonry, AAC (2 coats)
  • Water-based formula
  • Approved ARDEX products

Roofing

Concrete Roof Refurbishment Priming

Preparing built-up or repaired concrete roof areas before applying subsequent waterproofing layers in a multi-system build-up.

Improves inter-layer adhesion between existing prepared surfaces and new waterproofing applications, critical for system integrity in refurbishment.

  • Water-based liquid form
  • 0ºC to 80ºC service temperature
  • 5.03 MPa tensile strength
  • Applied before TuffTop membrane

Waterproofing

Prime internal wet areas

When preparing porous substrates in bathrooms, showers, or laundries before applying ARDEX waterproofing membranes and tile adhesives.

Its water-based, low VOC formulation quickly prepares surfaces, ensuring optimal adhesion for subsequent ARDEX products in moisture-prone zones.

  • Water-based primer
  • Low VOC content
  • 15-30 min drying time
  • Approved ARDEX products

Roofing

Reprime concrete roof surfaces

During concrete roof or balcony refurbishment, re-priming existing built-up areas before applying new ARDEX waterproofing systems.

Creates a clean, adherent base on previously treated concrete surfaces, ensuring reliable bond for subsequent ARDEX waterproofing membranes.

  • Concrete roofs, balconies
  • 15-30 min drying time
  • Internal/external use
  • Approved ARDEX products

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