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
ACTFLEX EP 250 Hydrostatic Epoxy Primer
or 4 interest-free payments with
One coat primes and seals. Two coats hold back rising damp and negative-side water to 250 kPa.
ACTFLEX EP250 is a two-part, waterborne epoxy primer, sealer and moisture barrier for concrete, masonry and cementitious substrates. One coat is the primer under FORSPEC systems. Two coats is the negative-side moisture barrier for damp slabs.
Where to use it
- Primer under FORSPEC membranes, coatings, mortars, levelling compounds and tile systems, including ACTFLEX 929 HV
- Two-coat moisture barrier for rising damp and efflorescence on concrete and masonry. Two coats are mandatory at 4.5% substrate moisture or above
- Basement, tunnel and below-grade details under negative-side hydrostatic pressure up to 250 kPa
Why waterproofers buy it
- Negative-side hydrostatic resistance up to 250 kPa (about 25.5 m head) in the two-coat system
- Applies to damp substrates. No standing water or visible water film
- Water based, 23 g/L VOC. Cleans off tools with water
- 1 to 1 mix by volume from pre-proportioned kits. About 90 minutes pot life
- Recoat 4 to 24 hours, membrane from 24 hours, tile from 24 hours to 5 days over a sand broadcast
- 20 kg and 4 kg kits
Coverage
20 kg kit: approximately 45.5 m² one coat, 22.7 m² two coats.
4 kg kit: approximately 9.1 m² one coat, 4.5 m² two coats.
Not for
Active leakage, running or standing water, moving cracks or movement joints, outside 10°C to 26°C or above 85% RH, UV exposure, use as a trafficable membrane, or potable-water storage without written FORSPEC approval.
All times at 25°C and 50% RH.
Negative-side hydrostatic pressure resistance up to 250 kPa in the approved two-coat system
One product, two roles: one-coat primer and sealer, or two-coat moisture barrier
Certified VOC content of 23 g/L, meeting GBCA Green Star Design & As Built V1.3-13.1.1B
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ACTFLEX EP 250 Hydrostatic Epoxy Primer
4 LT
The Waterproofing Shop
22/872 Canterbury Road
Roselands NSW 2196
Australia
How to Use
Technical Specifications
ACTFLEX EP 250 Hydrostatic Epoxy Primer
Sale price$165.00
Frequently bought together
System Build-Up Guide
Correct application makes all the difference.
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
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
Technical overview
Key applications
- One-coat primer and sealer on prepared mineral substrates within approved FORSPEC systems
- Two-coat negative-side moisture control and damp-proofing on concrete, masonry and compatible cementitious substrates
- Control of rising damp and efflorescence before coatings, membranes, mortars, levelling compounds and tile systems
- Consolidation and sealing of sound but porous or dust-prone mineral surfaces
- Hydrostatic coating for approved basement, tunnel, below-grade and water-retaining details up to 250 kPa negative-side pressure
- Primer beneath approved FORSPEC liquid-applied and sheet waterproofing membranes, including the certified ACTFLEX 929 HV bond system (XTecGen Report 0242-7)
- Sand-broadcast primer under approved tile adhesive systems
- Moisture control under floor coverings assessed in accordance with AS 1884:2021
Surface suitability
- Concrete (sound and stable, mechanically prepared to a clean open texture and vacuumed; may be damp but free from condensation and visible water film)
- Masonry (sound and stable, free from laitance, dust, friable material, coatings, adhesives, curing compounds, efflorescence, oil, grease, wax and standing water)
- Compatible cementitious substrates (defects and non-moving cracks repaired with an approved FORSPEC repair system and allowed to reach overcoat condition)
- Porous or dust-prone mineral surfaces (all weak and friable material removed first)
Apply only between 10C and 26C ambient and substrate and at 85% relative humidity or below, and never where condensation can form. Never apply over active leakage, running water, standing water, a visible water film, weak or friable substrates, moving cracks or movement joints. Not UV resistant, so protect from direct ultraviolet exposure. Not a trafficable membrane, and limited access after 24 hours does not establish a traffic classification. Not for unapproved chemical exposure, so confirm compatibility before applying any coating, membrane, mortar, adhesive or floor-covering system. Potable-water storage is not a standard application and requires written project-specific FORSPEC approval. Never alter the 1:1 by-volume ratio, batch by weight, over-dilute, retemper, or add fillers, solvents or unapproved materials. Both parts are classified hazardous chemicals and Part B is also dangerous goods and environmentally hazardous.
Calculate your coverage
You will need:
ACTFLEX EP 250 Hydrostatic Epoxy Primer
4Lr kit
0 Kits
Total coverage: 0 m²
This is an estimate only. Add 10% for wastage.
Technical Specifications
| Product Type | Two-component waterborne epoxy coating |
| Role | One coat as primer and sealer; two coats as the negative-side moisture barrier |
| Mixed Colour | Grey* |
| Cured Appearance | Semi-gloss, becoming matt with service and exposure* |
| Mix Ratio | 1:1 Part A : Part B by volume, never by weight |
| Part A Relative Density | 1.38 (Part A SDS) |
| Part B Relative Density | 1.26 (Part B SDS) |
| Nominal Mixed Density | 1.32 kg/L at equal component volumes |
| Volume Solids | 62%* |
| VOC Content | 23 g/L (ASTM D3960 / D2369, FORAY NATA 1231 Certificate P22070055) |
| Water Vapour Transmission | 1.63 g/m2/24 h at 0.20 mm mean film, two-coat system build (ASTM E96 desiccant, XTecGen Report 515-1) |
| Negative-Side Hydrostatic Pressure | 250 kPa, approximately 25.5 m head, approved two-coat system* |
| Pot Life | Approximately 90 minutes @ 25C, 50% RH* |
| Intercoat Time | Minimum 4 hours, maximum 24 hours @ 25C, 50% RH |
| Consumption | 0.44 kg/m2 per coat, approximately 2.3 m2 per kg |
| Two-Coat System Consumption | 0.88 kg/m2 total, approximately 1.14 m2 per kg |
| Theoretical Film Build | 333 microns WFT to 207 microns DFT per coat at 62% volume solids; 413 microns DFT over two coats |
| Kit Sizes | 20 kg and 4 kg pre-proportioned kits |
| Kit Yield | 20 kg kit approximately 45.5 m2 at one coat, approximately 22.7 m2 as the two-coat system |
| First Coat Dilution | Up to 5% clean water on porous substrates, up to 20% on dense substrates, 10% for approved spray. The second coat is never diluted |
| Minimum Cure Before Water-Based Layers | 24 hours @ 25C, 50% RH |
| Minimum Cure Before Solvent Coatings and Adhesives | 24 hours @ 25C, 50% RH |
| Tile-Over Window | 24 hours to 5 days, over a 0.5 mm silica sand broadcast at 700 g/m2 into the final wet coat |
| Limited Access | After 24 hours. Not a trafficable membrane |
| Full Cure | 7 days @ 25C, 50% RH |
| Application Temperature | 10-26C, ambient and substrate |
| Maximum Relative Humidity | 85% |
| Shelf Life | 24 months, unopened, stored as specified |
| AS/NZS 4020 Potable Water | Complies by manufacturer declaration. Not a recommended application; written project-specific FORSPEC approval required |
| Green Star | Meets GBCA Green Star Design & As Built V1.3-13.1.1B and Interiors V1.3-12.1.1B, limit 250 g/L |
| Hazard Classification | Both parts hazardous chemicals; Part B also dangerous goods and environmentally hazardous |
| * Typical Forspec characteristic values on standard production material. Values with certificate or report citations are tested results | |
Real Projects. Real Results.
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Before
After
Pool Renovation
Gold Coast, QLD
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Before
After
Below Ground Retaining Wall
Sydney, NSW
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Before
After
Concrete Water Tank
Perth, WA
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Before
After
Commercial Podium
Melbourne, VIC
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Before After
Swimming Pool Construction
Brisbane, QLD
Watch the install
Step-by-step from prep to top coat. Filmed on the tools, not in a studio.
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Frequently asked questions
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What is ACTFLEX EP 250 used for?
CompatibilityEP 250 is a 2-part water-based epoxy polyamide used as both a primer/sealer and a hydrostatic damp-proof barrier. Approved for potable water tanks, basements, tunnels, and negative-side waterproofing on concrete and masonry substrates.
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What hydrostatic pressure does it withstand?
PerformanceEP 250 withstands hydrostatic pressure up to 250 kPa - equivalent to 25 metres of water head. Apply two coats at 150 microns DFT each (300 microns wet film thickness total) for full hydrostatic performance.
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Coverage and pot life?
InstallationCoverage is 1.5 m² per litre for two coats. Two-part mix with pot life of 2 hours at 25°C (1 hour at 35°C). Touch-dry in 4 hours, recoat 4 hours to 5 days, full cure 7 days.
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What substrates can it bond to?
CompatibilityEP 250 bonds to concrete (old, new, or green), masonry, and cementitious substrates. The water-based chemistry penetrates damp surfaces - useful for retrofit waterproofing where the structure can't be fully dried.
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Is it potable-water certified?
ComplianceYes. EP 250 is certified to AS4020 and SS375 for potable water contact - approved for drinking water tanks and water-treatment applications. Low VOC, non-flammable, odourless.