ACTFLEX 200 Water-based primer
High-adhesion water-based primer for internal porous substrates
Low-odour water-based internal primer, tack-free in 1–2 hours, for FORSPEC wet area membranes.
ACTFLEX 200 coverage, coats and cure times
Water-based primer for internal concrete, masonry, render, fibre cement and porous screeds. It lifts the bond under ACTFLEX 906 WPU, ACTFLEX 989 CWP and other FORSPEC internal membranes.
- Coverage
- 4–6 m²/Ltypicalper coat, depends on porosity · TDS p2
- Coats
- 1single coat · TDS p2
- Wet film
- 80–120microns wet film thickness · TDS p2
- Tack-free
- 1–2 hat 25°C and 50% RH · TDS p2
- Overcoat
- Max 24 honce fully dry, abrade and re-prime if exceeded · TDS p2
- Consumption
- 0.17–0.25 L/m²typicalapprox., per coat · TDS p2
- Apply at
- +5 to +35°Csubstrate and ambient · TDS p2
- Max moisture
- 4.5%substrate moisture at application · TDS p2
- Max humidity
- 80%ambient relative humidity at application · TDS p2
From the FORSPEC data sheet, TDS-ACTFLEX200 · Revision 1 · 25 August 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.
Where ACTFLEX 200 is used
Use it for
- Primer under ACTFLEX 906 WPU, 989 CWP and FORSPEC internal systems
- Bathrooms, showers, laundries, wet rooms, kitchens and splash zones
- Internal walls, floors and concrete slabs
- Render, masonry blockwork, internal brickwork and solid plaster
- Fibre cement sheet, wet-area boards and compressed sheeting
- Sand/cement bedding and porous screeds, if not moisture compromised
Know before you start
- Internal use only. Not a membrane, a moisture barrier or for hydrostatic pressure
- Over 4.5% substrate moisture or 80% RH: specify ACTFLEX EP250 at two coats
- Not a screed additive or slurry coat: specify ACTFLEX 300 for those
- Not for particleboard, yellow tongue or untreated timber
How to apply ACTFLEX 200
- 01
Prepare
Sound, clean, dry surface, free of dust, laitance, oil and grease. Moisture 4.5% or less and ambient RH 80% or less. Repair voids with FORBUILD 100 or FORCRETE 100, then vacuum.
- 02
Stir
Stir mechanically for 2–3 minutes with a low-speed mixer at 300–500 rpm. Do not aerate it. Do not dilute unless FORSPEC approves in writing.
- 03
Apply
One even coat by brush, roller or airless spray at 80–120 microns wet film. Cover every edge, junction and upstand. Avoid puddling.
- 04
Check
The film should look uniform, with no glossy or puddled areas, pinholes or dry patches. Tape-pull test critical areas where required.
- 05
Dry
Tack-free in 1–2 hours at 25°C and 50% RH. Confirm it is fully dry before the membrane goes on. Protect from water and traffic until dry.
- 06
Overcoat
Apply the membrane once fully dry and within 24 hours. If longer, abrade lightly and re-prime.
A short guide from the data sheet. Read the full ACTFLEX 200 TDS before you start.
ACTFLEX 200 questions
What is ACTFLEX 200 used for?
It is a bonding primer under ACTFLEX 906 WPU, ACTFLEX 989 CWP and other FORSPEC internal waterproofing systems, on concrete, masonry, render, fibre cement and porous screeds.
How much ACTFLEX 200 do I need?
About 4–6 m² per litre: roughly 16–24 m² from a 4 L pack, 60–90 m² from 15 L and 80–120 m² from 20 L. Porous surfaces use more. These are typical values.
How long before I can apply the membrane?
It is tack-free in 1–2 hours at 25°C and 50% RH. Apply the membrane once fully dry and within 24 hours. After 24 hours, abrade lightly and re-prime.
Can I use ACTFLEX 200 outside?
No. It is for internal use only and is not approved for external applications.
What if the slab is damp or the air is humid?
Do not apply over 4.5% substrate moisture or above 80% ambient humidity. The TDS says to specify ACTFLEX EP250 at two coats instead.
Is ACTFLEX 200 a waterproofing membrane?
No. It is a primer, not a membrane and not a moisture barrier. The membrane that goes over it gives the waterproofing.
Used with ACTFLEX 200
ACTFLEX 200 TDS and SDS
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 200.