FORSPEC ACTFLEX MB200 20kg two-component high-performance polyurethane primer and moisture vapour barrier for concrete, screeds, terrazzo, natural stone, and timber flooring systems.
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ACTFLEX MB200 High-Performance Pure Polyurethane Resin Primer

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ACTFLEX MB200 is a high-performance, pure polyurethane resin primer designed as a fast-drying, single-component moisture vapor retarder and bonding primer. It enhances substrate strength, seals surfaces, and provides moisture barrier protection. Suitable for interior
and exterior applications.

Fast-drying moisture barrier protection up to 98% RH Fast-drying moisture barrier protection up to 98% RH
Single-component, ready-to-use primer—no mixing needed Single-component, ready-to-use primer—no mixing needed
Superior adhesion for coatings, screeds & membranes Superior adhesion for coatings, screeds & membranes
Title: 20KG
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FORSPEC ACTFLEX MB200 20kg two-component high-performance polyurethane primer and moisture vapour barrier for concrete, screeds, terrazzo, natural stone, and timber flooring systems.

ACTFLEX MB200 High-Performance Pure Polyurethane Resin Primer

20KG

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517
ACTFLEX MB200 High-Performance Pure Polyurethane Resin Primer20KG
$482.00
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 MB200 is a high-performance, single-component, solvent-free pure polyurethane resin primer engineered as a fast-drying bonding primer and moisture vapor retarder (MVR). Strengthens and seals substrates, provides moisture barrier protection up to 98% RH when applied in two crisscross coats, and approved for use beneath timber flooring. Suitable for interior and exterior applications.
Chemical Base Pure polyurethane resin (solvent-free)
Solid Contents ~100% (solvent-free)
Density 1.10–1.15 g/cm³ (~1.1 kg/L)
Viscosity 600–800 mPa·s @ 23°C
Colour Light yellowish
Tack Free Time ~60–90 min @ 25°C
Touch Dry 60–90 min (absorbent), 60–150 min (dense substrates)
Recoat Time 1–4 hours depending on substrate absorbency
Full Cure ~4 hours
Waterproof Time After 4 hours (full cure)
Application Temperature +5°C to +35°C
Service Temperature –40°C to +80°C (cured)
Recommended Thickness 1–2 coats @ 0.25 mm WFT each
Coverage ~4 m²/kg or ~4.4 m²/L
Moisture Barrier Resistance up to 98% RH (2 coats, cross-rolled)
Bond Strength High adhesion to concrete, cementitious and stone substrates
Shelf Life 24 months (unopened, dry, frost-free)

Key applications

  • Bonding primer for concrete & cementitious subfloors
  • Moisture vapor retarder beneath timber flooring
  • Priming under resilient flooring systems
  • Sealing & strengthening porous substrates
  • Priming over ceramic, terrazzo & natural stone
  • Priming over well-bonded adhesive or levelling compound residues

Surface suitability

  • Concrete & cementitious subfloors (low residual damp)
  • Ceramic tiles
  • Terrazzo
  • Natural stone substrates
  • Well-bonded adhesive residues
  • Well-bonded levelling compound residues

Substrate must be structurally sound, dry and free from dust, grease, laitance, weak layers or contaminants. Do not dilute. Subsequent coatings or levelling layers must be installed within 48 hours of priming — beyond that, the surface must be mechanically reactivated or reprimed. Apply between 5°C and 35°C.

Calculate your coverage

You will need:

ACTFLEX MB200 High-Performance Pure Polyurethane Resin Primer

ACTFLEX MB200 High-Performance Pure Polyurethane Resin Primer

20kg Kit

0 Kits

Total coverage: 0 m²

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

Technical Specifications

Chemical BasePure polyurethane resin (solvent-free)
Solid Contents~100% (solvent-free)
Density1.10–1.15 g/cm³ (~1.1 kg/L)
Viscosity600–800 mPa·s @ 23°C
ColourLight yellowish
Tack Free Time~60–90 min @ 25°C
Touch Dry60–90 min (absorbent), 60–150 min (dense substrates)
Recoat Time1–4 hours depending on substrate absorbency
Full Cure~4 hours
Waterproof TimeAfter 4 hours (full cure)
Application Temperature+5°C to +35°C
Service Temperature–40°C to +80°C (cured)
Recommended Thickness1–2 coats @ 0.25 mm WFT each
Coverage~4 m²/kg or ~4.4 m²/L
Moisture Barrier Resistanceup to 98% RH (2 coats, cross-rolled)
Bond StrengthHigh adhesion to concrete, cementitious and stone substrates
Shelf Life24 months (unopened, dry, frost-free)

Downloads

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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 MB200 used for?
    Compatibility

    MB200 is a moisture vapour retarder and primer applied beneath coatings, screeds, timber, and resilient floors over concrete substrates. Blocks moisture transmission up to 98% RH - critical for moisture-sensitive flooring over fresh or damp slabs.

  • What moisture levels can it block?
    Performance

    MB200 blocks moisture transmission up to 98% RH with two cross-rolled coats. The 100% solids pure polyurethane resin creates an impermeable vapour barrier that lets you install moisture-sensitive flooring earlier.

  • Coverage and application?
    Installation

    Coverage is approximately 4-4.4 m² per litre (4 m² per kg). Apply 1-2 coats at 0.25mm WFT each, cross-rolled at 90 degrees for full coverage. Single-component, ready-to-use - no mixing needed.

  • What substrates does it work on?
    Compatibility

    Works over concrete, terrazzo, natural stone, and cementitious subfloors. Touch-dry in 60-90 minutes on absorbent surfaces (60-150 minutes on dense), full cure approximately 4 hours.

  • Service temperature range?
    Performance

    Service temperature range -40°C to +80°C once cured - the widest range in the Forspec primer family. Suitable for cold-storage floors, plant rooms, and outdoor applications.

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