ACTFLEX EP 250 Epoxy primer
Two-component waterborne epoxy primer, sealer and moisture-barrier coating
One coat primes concrete for FORSPEC membranes. Two coats make the moisture barrier.
ACTFLEX EP 250 coverage, coats and cure times
Water-based two-part epoxy for prepared concrete, masonry and cementitious surfaces. One coat is the primer and sealer; two coats control moisture in a damp slab.
- Coverage
- 0.32 kg/m²per coat, about 3.1 m² per kg · TDS p2
- 20 kg kit
- ≈ 62.5 m²in one coat; about 31.3 m² in two coats · TDS p3
- Coats
- 1 or 2one to prime, two for moisture control · TDS p5
- Dry film
- 150 µmper coat; 300 µm in two coats · TDS p3
- Recoat
- 4–24 htypicalminimum 4 hours, maximum 24 hours · TDS p2
- Membrane after
- 24 htypicalminimum cure before water-based layers · TDS p2
- Pot life
- ≈ 90 mintypicalat 25°C · TDS p2
- Pack
- 4 kg, 20 kgpre-proportioned two-part kits · TDS p3
- Apply at
- 10–26°Cair and surface, 85% humidity at most · TDS p3
From the FORSPEC data sheet, TDS-EP250 · Revision 4 · 12 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.
Where ACTFLEX EP 250 is used
Use it for
- Primer under FORSPEC liquid and sheet membranes
- Two-coat moisture control on damp concrete
- Rising damp and efflorescence control
- Sealing porous or dusty concrete and masonry
- Basement and below-ground details with water pressure from behind
Know before you start
- Not UV resistant: protect it from direct sun
- Not a trafficable membrane
- Never over active leaks, standing water, moving cracks or movement joints
- Never mix by weight or change the 1 : 1 by volume ratio
How to apply ACTFLEX EP 250
- 01
Prepare
Sound, clean concrete or masonry with an open texture, all dust vacuumed off. It may be damp but with no condensation or visible water film.
- 02
Mix
Part A to Part B 1 : 1 by volume, never by weight. Mix at 300 to 500 rpm for 2 to 3 minutes. Pot life is about 90 minutes.
- 03
First coat
0.32 kg/m² by roller, stiff broom or squeegee. The first coat may be thinned with clean water: up to 5% on porous surfaces, up to 20% on dense ones.
- 04
Second coat
For moisture control, a second coat at 0.32 kg/m², never thinned, 4 to 24 hours after the first. Two coats are mandatory at 4.5% substrate moisture or above.
- 05
Cover
Let it cure at least 24 hours before FORSPEC membranes and other water-based layers. ACTFLEX ULTRA TC is the exception: apply it 12 to 24 hours after the final coat. Full cure is 7 days.
A short guide from the data sheet. Read the full ACTFLEX EP 250 TDS before you start.
How much ACTFLEX EP 250 do I need?
4 kg kit
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 EP 250 product page · Internal wet areas system · Epoxy flooring system
Where it has been used
FORSPEC projects built with ACTFLEX EP 250.
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 EP 250 test reports and compliance
- VOC content
- 23 g/LFORAY Certificate P22070055
- Water vapour transmission
- 1.63 g/m²/24 h at the two-coat buildXTecGen Report 515-1
Download the reports
Results as stated in the data sheet, TDS-EP250 · Revision 4 · 12 November 2026. Warranty up to 25 years, depending on the system: ask FORSPEC which term applies to your system.
ACTFLEX EP 250 questions
How much ACTFLEX EP 250 do I need?
Allow 0.32 kg per square metre for each coat. A 20 kg kit covers about 62.5 m² in one coat or 31.3 m² in two. A 4 kg kit covers about 12.5 m² in one coat or 6.3 m² in two.
One coat or two?
One coat as a primer and sealer. Two coats for moisture control. Two coats are mandatory where the substrate moisture reading is 4.5% or above.
Can it go on damp concrete?
Yes. The surface may be damp but must be free of condensation and any visible film of water. Never apply it over active leaks or standing water.
How long before the membrane goes on?
A minimum of 24 hours at 25°C before FORSPEC membranes and other water-based layers. The exception is ACTFLEX ULTRA TC: apply it 12 to 24 hours after the final coat.
How do I mix it?
Part A and Part B at 1 to 1 by volume, never by weight, at 300 to 500 rpm for 2 to 3 minutes. The kits are pre-proportioned, so mixing the full contents of both gives the right ratio.
Can I tile straight onto it?
Yes, with the sand-broadcast method: two coats, 0.5 mm silica sand broadcast into the wet final coat at 700 g/m², loose sand removed after 24 hours, then tile adhesive within 5 days.
Used with ACTFLEX EP 250
ACTFLEX EP 250 TDS and SDS
Show all 5 documents ↓
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 EP 250.