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
ACTFLEX EP 250 is a two-part epoxy polyamide coating that provides effective protection against water infiltration, rising damp, efflorescence, and hydrostatic pressure. Approved for use with potable water, it meets AS4020:2005 and SS375-2001 standards. Suitable for concrete, masonry, and cementitious surfaces, it acts as a primer, sealer, and damp-proofing barrier. It also supports moisture-sensitive coatings and serves as a hydrostatic barrier for negative side surfaces. Non-flammable, low Odor, and compatible with green concrete, it enhances adhesion and structural integrity.
Waterproofs against hydrostatic pressure up to 250 kPa
Two-component water-based epoxy for concrete & masonry
Certified for potable water & meets green building standards
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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
- Negative-side hydrostatic waterproofing & damp-proofing
- Potable water tanks, reservoirs & infrastructure (AS4020 / SS375 compliant)
- Concrete sealing & priming (prevents efflorescence and rising damp)
- Substrate priming under moisture-sensitive coatings & membranes
- Green concrete sealing for early-stage protection
- Strengthening degraded, porous or dust-prone concrete
- Basements, tunnels & below-grade structures under hydrostatic pressure
- Industrial & commercial waterproofing requiring chemical resistance
Surface suitability
- New, old & green concrete
- Masonry & concrete blocks
- Cementitious surfaces (screeds, renders, levelling compounds)
- Stone
- Timber
Not classified as a trafficable membrane. Not UV resistant — must not be exposed to UV light. Ceases to cure below 10°C; curing is also adversely affected above 85% relative humidity. Confined areas require ventilation during the curing cycle. Tiling must commence within 5 days of cure; sand binding of the final wet coat required.
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, water-based epoxy polyamide moisture barrier |
| Chemical Base | Water-based epoxy polyamide |
| Colour | Grey, semi-gloss finish (matt over time) |
| Solid Contents | 44% |
| Density | 1.25 g/cm³ |
| Pot Life | 2 hours @ 25°C; 1 hour @ 35°C |
| Tack Free / Touch Dry | 4 hours @ 25°C, 50% RH |
| Recoat Time | 4 hours min; up to 5 days max for tiling |
| Waterproof Time | 24 hours @ 25°C / 50% RH before recoating |
| Foot Traffic | 24 hours @ 25°C |
| Full Cure | 7 days @ 25°C, 50% RH |
| Application Temperature | 10°C–26°C |
| Service Temperature | –10°C to +65°C |
| Recommended Thickness | 150 µm DFT per coat; 300 µm DFT total (2 coats) |
| Coverage | 1.5 m²/L total for 2 coats @ 300 µm WFT per coat |
| Hydrostatic Pressure Resistance | Up to 250 kPa (25 m head of water) |
| Certifications | AS4020, SS375, potable water certified, Green Building Council compliant |
| Features | Non-flammable, low VOC, odourless, excellent chemical resistance |
| Shelf Life | 24 months |
Real Projects. Real Results.
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Before
After
Pool Renovation
Gold Coast, QLD
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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 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.