ACTFLEX 700 PU PRIMER Polyurethane primer
Fast-drying moisture-curing polyurethane primer for porous substrates
The fast primer for ACTFLEX 929 SL and 929 HV. Touch dry in as little as 30 minutes.
ACTFLEX 700 PU PRIMER coverage, coats and cure times
Single-pack moisture-curing polyurethane primer for porous substrates under FORSPEC solvent-based membranes and sealants. It also bonds re-coats to existing solvent-based polyurethane membranes.
- Coverage
- 4–6 m²/Ltypicalper coat, depends on porosity · TDS p2
- Coats
- 1one coat only · TDS p3
- Nominal DFT
- 60 µmone coat, per FORSPEC project specifications · TDS p2
- Touch dry
- 30 mintypicalat 20°C and 50% RH, 15 minutes at 30°C · 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
- Overcoat
- Max 24 honce touch dry, re-prime if exceeded · TDS p2
- Apply at
- 10–26°Cambient and substrate · TDS p2
- Pack
- 1, 4, 17 L17 L covers approx. 68–102 m² per coat · TDS p1
From the FORSPEC data sheet, TDS-700PU · Revision 2 · 12 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 700 PU is used
Use it for
- Primer for porous bases under FORSPEC solvent-based membranes
- Primer under ACTFLEX 75FC and solvent-based sealants, dry internal
- Bonding agent for re-coating solvent-based polyurethane membranes
- New and old concrete, render, masonry, brickwork and timber
- Wet-area and compressed fibre cement sheet, per the host TDS
Know before you start
- Not a moisture or vapour barrier: moisture makes the primer blister and peel
- Never use under or with water-based products
- Not UV stable: never leave exposed beyond 48 hours after full cure
- Flammable. Not below 10°C. Use opened containers the same day
How to apply ACTFLEX 700 PU
- 01
Prepare
Sound, dry, clean surface free of dust, laitance, oil, grease, curing compounds and loose material. Repair holes and non-moving cracks with FORBUILD 100, FORCRETE 100 or the FORSPEC epoxy crack repair range.
- 02
Trial
Do a staining trial area on every substrate before full application. On old polyurethane membranes, abrade glossy surfaces and remove all contamination first.
- 03
Stir
Stir gently and thoroughly without whipping in air. Keep ventilation running and all ignition sources out. Do not dilute unless FORSPEC approves in writing.
- 04
Apply
ONE even coat by brush, roller or approved spray at 4–6 m² per litre. Work it into the surface texture without ponding or heavy film build.
- 05
Dry
Touch dry in as little as 30 minutes at 20°C and 50% RH. Check with a firm finger touch with no transfer.
- 06
Overcoat
Install backing rod, sealant or the membrane once touch dry and within 24 hours. If the window is exceeded, re-prime.
A short guide from the data sheet. Read the full ACTFLEX 700 PU TDS before you start.
How much ACTFLEX 700 PU do I need?
17 L pail
The same primer figures the membrane calculators use, at the low end of each TDS range. The membrane's own TDS names the primer for your substrate: check it before you order.
You need
0 packs
Where the figures come from
The same primer figures the membrane calculators use, at the low end of each TDS range. The membrane's own TDS names the primer for your substrate: check it before you order.
- EP 250 per coat; kit yields: 0.32 kg/m²; 4 kg kit 12.5 m² one coat, about 6.3 m² two coats; 20 kg kit 62.5 and 31.3 m². TDS-EP250, R4, 12 Nov 2026, page 3
- 700 PU: 4 to 6 m²/L per coat (17 L at 4 m²/L = 68 m²). TDS-700PU, R2, 12 Aug 2026, page 2
- ACTFLEX 300 tack coat: 15 kg pail primes about 45 to 75 m² per coat (45 used). TDS-ACTFLEX300, R2, 12 Aug 2026, page 3
- SUPERBOND 007, dense substrates: 8 to 12 m²/L (8 used); 1000 mL pack. TDS-SUPERBOND007, R1, 25 Aug 2026, page 2
- SUPERPRIME 008, non-porous: 8 to 12 m²/L (8 used); 1000 mL pack. TDS-SUPERPRIME008, R1, 25 Aug 2026, page 2
More: ACTFLEX 700 PU product page · Balconies & podiums system · Planter boxes system
Drawings for the systems it goes in
FORSPEC standard details as PDF and DXF. Each sheet is a generic detail: the specification names the products.
ACTFLEX 700 PU questions
Which systems is ACTFLEX 700 PU PRIMER for?
The solvent-based ACTFLEX 929 SL and ACTFLEX 929 HV membrane systems, plus ACTFLEX 75FC and solvent-based sealants on dry internal surfaces.
How long until I can coat over it?
Touch dry in as little as 30 minutes at 20°C and 50% RH, or 15 minutes at 30°C. Coat within 24 hours of touch dry, or re-prime.
How much do I need?
About 4–6 m² per litre per coat. A 1 L pack covers 4–6 m², a 4 L pack 16–24 m² and a 17 L pack 68–102 m². Porous surfaces sit at the low end.
Is it a moisture barrier?
No. Moisture makes the primer blister and peel. For moisture control specify ACTFLEX EP250 or ACTFLEX MB200 per the host system TDS.
Can I use it under a water-based membrane?
No. Never use it under or with water-based products.
Can I leave it exposed?
No. It is not UV stable. Overcoat it with the specified membrane or sealant and never leave it exposed beyond 48 hours after full cure.
Used with ACTFLEX 700 PU
ACTFLEX 700 PU 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 700 PU.