Forspec ACTFLEX 300 Advanced Primer 15L for improving adhesion of waterproofing membranes to concrete, masonry, fibre cement, and other porous substrates.
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ACTFLEX 300 Advanced Primer and Additive 15L

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ACTFLEX 300 is a high-adhesion primer designed for multiple roles within Forspec systems. It penetrates deeply to provide strong bonding on PVC, masonry, and concrete surfaces. The product serves as a primer for Forspec Butyl series membranes, acts as a chemical binder in screeds through slurry coats and admixtures, and functions as a primer for Forspec cementitious and water-based membranes when specified. It improves screed strength, reduces shrinkage, prevents delamination, controls dusting, and is easily applied by brush, roller, or spray.

Exceptional bonding for multiple waterproofing systems Exceptional bonding for multiple waterproofing systems
Reduces shrinkage and prevents delamination Reduces shrinkage and prevents delamination
Easy application by brush, roller, or spray Easy application by brush, roller, or spray
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Pickup available at The Waterproofing Shop

Usually ready in 24 hours

Forspec ACTFLEX 300 Advanced Primer 15L for improving adhesion of waterproofing membranes to concrete, masonry, fibre cement, and other porous substrates.

ACTFLEX 300 Advanced Primer and Additive 15L

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517
ACTFLEX 300 Advanced Primer and Additive 15L
$275.00
Add it to your kit

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System Build-Up Guide

Correct application makes all the difference.

View All Details

Pool System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX FLEXPLUS
  • 4 ACTFLEX HYDROPLUG
  • 5 ACTFLEX AT MESH
  • 6 ACTFLEX 988 CWP (2 Coats)
  • 7 Tile Adhesive
  • 8 Pool Finish
Pool System Build-Up

Retaining Wall System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX MS PRO
  • 4 ACTFLEX AT MESH
  • 5 ACTFLEX 988 CWP (2 Coats)
  • 6 Protection Board (Optional)
  • 7 Drainage System
  • 8 Backfill
Retaining Wall System Build-Up

Tank System Build-Up

  • 1 Concrete Substrate
  • 2 Crack Repair (if required)
  • 3 ACTFLEX FLEXPLUS
  • 4 ACTFLEX AT MESH
  • 5 ACTFLEX 988 WMP (2 Coats)
  • 6 Protective Coating (Optional)
  • 7 Water
Tank System Build-Up

Technical overview

ACTFLEX 300 is a high-adhesion primer formulated for PVC, masonry and concrete substrates. Engineered for multiple roles within Forspec systems — primer for Butyl-series waterproofing membranes, chemical binder for screed systems (slurry coats & admixtures), and primer for cementitious and water-based membranes. Deep penetration improves adhesion, reduces dusting and prevents delamination.
Chemical Base Acrylic polymer primer (high adhesion resin)
Cure Mechanism Water evaporation & film formation
Colour Cloudy white
Solid Contents ~40–50%
Density ~1.0–1.1 g/cm³
Tack Free Time 1–2 hours
Touch Dry 1–2 hours (primer use)
Recoat Time Within 24 hours (else abrade & reapply)
Full Cure 24 hours before membrane/screed application
Waterproof Time 1–2 hours to tack-free @ 25°C, 50% RH
Application Temperature +5°C to +35°C
Service Temperature –40°C to +80°C
Recommended Thickness 80–120 microns WFT
Coverage ~3–5 m²/kg depending on substrate porosity
Bond Strength High adhesion
Application Method Brushable / sprayable liquid
Shelf Life 12 months

Key applications

  • Priming under Forspec Butyl-series membranes
  • Priming under cementitious membranes (e.g. ACTFLEX 988 CWP, 989 CWP)
  • Priming under water-based waterproofing membranes
  • Slurry coat binder for Forspec screed systems
  • Screed mix admixture (bond strength, shrinkage control)
  • Tiled finishes, podium screeds & external balcony screeds

Surface suitability

  • PVC
  • Concrete
  • Masonry
  • Porous surfaces

Not suitable for negative-side waterproofing or continuous hydrostatic pressure. Not recommended on particleboard, yellow tongue or untreated timber. Not compatible with silicone, oil-based or bituminous surfaces unless approved by Forspec.

Calculate your coverage

You will need:

ACTFLEX 300 Advanced Primer and Additive 15L

ACTFLEX 300 Advanced Primer and Additive 15L

15kg Kit

0 Kits

Total coverage: 0 m²

This is an estimate only. Add 10% for wastage.

Technical Specifications

Chemical BaseAcrylic polymer primer (high adhesion resin)
Cure MechanismWater evaporation & film formation
ColourCloudy white
Solid Contents~40–50%
Density~1.0–1.1 g/cm³
Tack Free Time1–2 hours
Touch Dry1–2 hours (primer use)
Recoat TimeWithin 24 hours (else abrade & reapply)
Full Cure24 hours before membrane/screed application
Waterproof Time1–2 hours to tack-free @ 25°C, 50% RH
Application Temperature+5°C to +35°C
Service Temperature–40°C to +80°C
Recommended Thickness80–120 microns WFT
Coverage~3–5 m²/kg depending on substrate porosity
Bond StrengthHigh adhesion
Application MethodBrushable / sprayable liquid
Shelf Life12 months

Downloads

Real Projects. Real Results.

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    Pool Renovation

    Gold Coast, QLD

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    Below Ground Retaining Wall

    Sydney, NSW

  • Concrete Water Tank Concrete Water Tank Before After

    Concrete Water Tank

    Perth, WA

  • Commercial Podium Commercial Podium Before After

    Commercial Podium

    Melbourne, VIC

  • Before After

    Swimming Pool Construction

    Brisbane, QLD

How to install

Watch the install

Step-by-step from prep to top coat. Filmed on the tools, not in a studio.

Watch the install poster

Why Choose

The Waterproofing Shop?

We supply premium waterproofing products backed by expert advice, fast service and real-world experience.

100% Australian Owned & Operated 100% Australian
Owned & Operated
30+ Years in the Waterproofing Industry 30+ Years in the
Waterproofing Industry
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in Stock
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Australia Wide
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Support

Frequently asked questions

View all FAQs
  • What is ACTFLEX 300 used for?
    Compatibility

    300 Primer is a multi-role product: primer for butyl membranes, chemical binder for screeds (PolyCrete, SCREED X, FORCEM, Level X Pro), and primer for cementitious and water-based membranes. The Swiss-army-knife additive in the Forspec range.

  • Why is it called an 'Advanced Primer and Additive'?
    Performance

    When used as a binder additive in screeds, 300 improves screed strength, reduces shrinkage, and prevents delamination from substrates. As a primer, it improves adhesion and prevents dusting. Different role, same product.

  • Coverage when used as a primer?
    Installation

    Coverage is 3-5 m² per kg depending on substrate porosity. Tack-free in 1-2 hours at 25°C/50% RH. Full cure 24 hours before membrane or screed application. Apply at 80-120 microns WFT.

  • Can it be used as a screed additive?
    Compatibility

    Yes - 300 is the recommended screed binder additive paired with FORCEM, SCREED X, and Level X Pro. Refer to the screed product's TDS for the correct 300 dosage rate and mix water reduction.

  • Service temperature range?
    Performance

    Service temperature -40°C to +80°C once cured. Recoat within 24 hours or abrade the surface before reapplication. PVC, masonry, and concrete are all suitable substrates.

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