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ACTFLEX 600 pack
● TDS-ACTFLEX600 · Rev 2 · 13 November 2026

ACTFLEX 600 PRIMER Hybrid PU primer

One-component moisture-cured hybrid polyurethane primer for ACTFLEX 906 WPU

A bonding primer for ACTFLEX 906 WPU. One coat, fully cured in 6 hours at 25°C.

One coat onlyFully cured 6 hApply 10–26°C
4–6 m²/LCoverage
1Coats
50–100Dry film
Approx. 20 minTouch dry
3 hWaterproof
6 hFull cure
TDS ↓SDS ↓Send us your job →Where to buy →
● The numbers

ACTFLEX 600 PRIMER coverage, coats and cure times

One-component hybrid polyurethane primer that cures on air moisture, yet takes the water-based ACTFLEX 906 WPU membrane over it. For concrete, render, masonry, fibre cement and precast panels.

Coverage
4–6 m²/Ldepends on the surface · TDS p2
Coats
1one coat only · TDS p2
Dry film
50–100microns, recommended thickness · TDS p2
Touch dry
Approx. 20 mintypicalminimum, interpolated from 20°C and 30°C values · TDS p2
Waterproof
3 htypicalTDS term, at 25°C and 50% RH · TDS p2
Full cure
6 htypicalat 25°C and 50% RH · TDS p2
Apply at
+10 to +26°Csubstrate and ambient · TDS p2
Pack
4 L and 17 L17 L covers approx. 68–102 m² · TDS p2
Shelf life
9 monthsunopened, stored as specified · TDS p2

From the FORSPEC data sheet, TDS-ACTFLEX600 · Revision 2 · 13 November 2026. Times are at 25°C and 50% relative humidity unless the data sheet says otherwise. Typical = FORSPEC’s own typical value, not a laboratory-certified one.

● Is it right for the job

Where ACTFLEX 600 is used

Use it for

  • Bonding primer under ACTFLEX 906 WPU water-based polyurethane membrane
  • New and aged concrete
  • Rendered surfaces and masonry
  • Compressed fibrous cement sheeting
  • Precast panels and smooth factory-finished surfaces
  • Existing waterproofing layers, for intercoat bonding in repairs

Know before you start

  • Not a membrane or moisture barrier: for moisture control specify ACTFLEX EP250 or MB200
  • Not UV stable: overcoat with ACTFLEX 906 WPU and never leave it exposed
  • Not for ACTFLEX 929 SL or 929 HV systems: use ACTFLEX 700 PU PRIMER
  • One coat only. Not below 10°C or above 26°C, and not over damp substrates
● On site

How to apply ACTFLEX 600

  1. 01

    Prepare

    Remove dust, dirt, oil, grease, wax and loose contaminants. Grind or abrade off old coatings, laitance and weak layers. Repair cracks and holes with FORBUILD 100 or FORCRETE 100, cured and flush.

  2. 02

    Check

    Surface must be dry, stable and sound. Wipe non-porous surfaces with solvent or degreaser. Do a small adhesion test on critical surfaces where required. Vacuum off fine dust.

  3. 03

    Stir

    Stir thoroughly but gently, do not whip in air. Keep ventilation running and exclude all ignition sources. Do not dilute unless FORSPEC approves in writing.

  4. 04

    Apply

    ONE even coat by roller, brush or approved spray at 4–6 m² per litre for 50–100 microns dry film. Cover all edges, junctions and transitions. Avoid puddling.

  5. 05

    Cure

    Touch dry in about 20 minutes and fully cured in 6 hours at 25°C and 50% RH. Do not leave it exposed, it is not UV stable.

  6. 06

    Overcoat

    Apply ACTFLEX 906 WPU once touch dry, within the same working session. Use all contents the same day: opened product skins and gels.

A short guide from the data sheet. Read the full ACTFLEX 600 TDS before you start.

Learn to install it

Hands-on FORSPEC training that covers ACTFLEX 600 PRIMER.

TrainingFORSPEC Practical Waterproofing Course: 1 Day Compliance Training
● Questions

ACTFLEX 600 questions

Which membrane does ACTFLEX 600 PRIMER go under?

ACTFLEX 906 WPU, the water-based polyurethane membrane. For the solvent-based ACTFLEX 929 SL and 929 HV systems, specify ACTFLEX 700 PU PRIMER.

How many coats do I apply?

One coat only, at 4–6 m² per litre, for 50–100 microns dry film.

How long before I can apply ACTFLEX 906 WPU?

Once the primer is touch dry (about 20 minutes at 25°C and 50% RH), within the same working session. The TDS gives 3 hours to waterproof and 6 hours to full cure.

How much do I need?

About 4–6 m² per litre. A 4 L pack covers about 16–24 m² and a 17 L pack about 68–102 m².

Can I leave the primer exposed?

No. It is not UV stable. It must be overcoated with ACTFLEX 906 WPU and never left exposed.

Can I save part of a tin for tomorrow?

No. Use all the contents the same day. It is moisture-cured and will skin and gel in a part-used container.

● Documents

ACTFLEX 600 TDS and SDS

TDSACTFLEX 600 technical data sheet (Rev 2 · 13/11/2026)SDSACTFLEX 600 safety data sheet (10/2021)

Always work from the current data sheet. Every FORSPEC TDS and SDS →

Specify it. Or buy it.

Send the drawings or photos and FORSPEC comes back with the system, the details and the quantities. Or find a FORSPEC stockist for ACTFLEX 600.

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