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 62.5 m² one coat, 31.3 m² two coats.
4 kg kit: approximately 12.5 m² one coat, 6.3 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
4kg 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 | 0.32 kg/m2 per coat, approximately 3.1 m2 per kg |
| Two-Coat System Consumption | 0.64 kg/m2 total, approximately 1.6 m2 per kg |
| Theoretical Film Build | 242 microns WFT to 150 microns DFT per coat at 62% volume solids; 300 microns DFT over two coats |
| Kit Sizes | 20 kg and 4 kg pre-proportioned kits |
| Kit Yield | 20 kg kit approximately 62.5 m2 at one coat, approximately 31.3 m2 as the two-coat system; 4 kg kit approximately 12.5 m2 at one coat, approximately 6.3 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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After
Concrete Water Tank
Perth, WA
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Commercial Podium
Melbourne, VIC
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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 two-part waterborne epoxy used as a one-coat primer and sealer under FORSPEC systems, and as a two-coat negative-side moisture barrier for rising damp, basements, tunnels and below-grade details on concrete and masonry.
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What hydrostatic pressure does it withstand?
PerformanceEP 250 resists negative-side hydrostatic pressure up to 250 kPa (approximately 25.5 m head) in the approved two-coat system. Apply two coats at 150 microns DFT each (300 microns DFT total) for full hydrostatic performance. The 250 kPa figure is FORSPEC internal data.
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Coverage and pot life?
InstallationCoverage is 0.32 kg/m² per coat (approximately 3.1 m² per kg), or 0.64 kg/m² total for the two-coat system (approximately 1.6 m² per kg). Pot life is approximately 90 minutes at 25°C, 50% RH. Recoat after a minimum of 4 hours and within a maximum of 24 hours. Full cure 7 days.
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What substrates can it bond to?
CompatibilityEP 250 bonds to correctly prepared concrete, masonry and cementitious substrates. It can be applied to damp substrates (no standing water or visible water film), which suits retrofit work where the structure can't be fully dried.
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Is it potable-water certified?
ComplianceNo potable-water certification is held. AS/NZS 4020 compliance is by manufacturer declaration only. Potable-water storage is not a recommended application and requires written project-specific FORSPEC approval. VOC content is 23 g/L (FORAY NATA 1231 Certificate P22070055).