Self-priming seal coat system
- Mechanically prepare and vacuum the substrate
- Apply a first coat of Rayson HydroShield WE40 as the primer
- Apply a second coat of Rayson HydroShield WE40 as the coloured topcoat
Rayson HydroShield · Water-based epoxy
Rayson HydroShield WE40
Rayson HydroShield WE40 is a two-component, water-based epoxy used as a self-priming primer-and-topcoat system on concrete, screed, asphalt and metal — including damp surfaces.
ConcreteCement screed TDS RY-TDS-301
Best for
Best for coloured seal coats on warehouse floors, production areas and car park decks in normal to medium-heavy service, especially where low odour is required.
HydroShield WE40 is a water-dilutable two-component epoxy that works as its own primer and topcoat — one product, applied in successive coats, takes the floor from prepared concrete to a finished coloured seal coat. That self-priming simplicity cuts product count and programme risk on straightforward floors.
The formulation offers good hiding power, high mechanical properties and good anti-corrosive resistance, with excellent adhesion to mechanically prepared surfaces — pull-off strength exceeds the cohesive strength of the concrete itself. It tolerates dry or damp substrates, which suits ground-bearing slabs and tropical humidity.
Being water-based, WE40 is suitable for use in unventilated areas, making it a practical choice for basement car parks, enclosed plant areas and occupied buildings where solvent products cannot be used.
In Malaysia
Supplied by Epovex Coatings Sdn. Bhd., Company No. 202601042128 (1704223-A). The Malaysia launch is scheduled for 1 March 2027; confirm availability and lead time for your project. Installation through an authorised applicator in Johor, Kuala Lumpur or Penang introduced by Rayson, who quotes and warrants the workmanship, or by your own crew with Rayson’s application guidance.
Send an enquiryKey benefits
- Self-priming — one product serves as primer and topcoat
- Water-based and suitable for unventilated areas
- Applies to dry or damp surfaces
- Good hiding power with high mechanical properties and anti-corrosive resistance
Recommended uses
- Coloured seal coats on cementitious screeds
- Warehouse flooring and production floors in normal to medium-heavy exposure
- Car park deck coatings
- Self-priming primer-and-topcoat systems on new and existing concrete
Application
- Roller
- Brush
- Airless spray
| Specification | Data sheet value |
|---|---|
| Coverage | 6–8 m² per kg per coat, varying with substrate condition |
| Mixing | Two pre-weighed parts, mix ratio 4:1 (A:B) by weight; mix mechanically for at least 2–3 minutes; pot life up to 30 minutes at 30 °C |
| Drying and curing | Final cure 7 days |
| Pack sizes | Part A 4 kg / Part B 1 kg, or Part A 16 kg / Part B 4 kg per set |
Typical systems
UV-stable variant for exposed areas
- Apply Rayson HydroShield WE40 as primer and body coat
- Finish exposed or daylight-flooded zones with Rayson UraForce WB58 for colour stability
Limitations
- Minimum substrate temperature 5 °C; curing between +10 °C and +35 °C; concrete moisture content maximum 5%
- Mixed material must be used within its pot life; cures faster in hot weather and in large batches
- A thin-film seal coat — not intended for heavy-duty impact or thick-build duties
- Epoxy chemistry — will yellow and chalk under exterior UV exposure
Not suitable for
- Heavy-duty impact zones needing thick-build screeds or self-levelling systems
- Exterior UV-exposed surfaces without a UV-stable topcoat
- Substrates with standing water or moisture above 5%
- Strong chemical containment areas — use a system matched to the exposure schedule
Used with
Jobs and industries
Jobs that use Rayson HydroShield WE40
Rayson-authorised applicators in Johor, Kuala Lumpur and Penang install Rayson HydroShield WE40 on these jobs and in these industries; its layer is marked in each build-up. You can also order it direct and apply it yourself, with the step-by-step guide. Each page shows how the work runs, what to send for a quotation and what decides the price.
Floor systems, laid by an applicator or bought direct
All floor systems ↗ 01 Rayson system
Concrete floor sealer
Stop a concrete floor dusting: UraForce WB60 clear indoors, SB65 clear outdoors, or a coloured HydroShield WE40 or WE45 seal coat; laid or sold direct.
- UraForce WB60 clear polyurethane, two coats
- Concrete slab, ground, repaired and vacuumed
Outdoors and on stone: UraForce SB65 clear. A coloured seal coat: HydroShield WE40 or WE45, its own primer.
Quoted after inspectionOrder it direct, with a step-by-step guide
02 Rayson system
Epoxy floor paint
FloorGuard R50 over PrimeBond E20, or water-based HydroShield WE40, sold direct with a step-by-step guide: apply it yourself, or have the applicator do it.
- FloorGuard R50, second coat
- FloorGuard R50, first coat, 0.3 to 0.5 kg/m²
- PrimeBond E20 primer, 6 to 8 m² per kg
- Concrete at least 28 days old, ground and vacuumed
Ramps: aggregate broadcast into the first coat for grip. Water-based: HydroShield WE40, its own primer. Porches open to the sun: UraForce SB72 over PrimeBond S30.
Quoted per orderJobs in Johor
03 Rayson system
Factory and warehouse epoxy flooring
Forklift aisles, production floors and loading bays in Johor’s industrial parks, specified by the maker.
- LevelShield SL120 self-levelling epoxy
- PrimeBond E20 epoxy primer
- Concrete slab, ground and moisture-tested
Storage halls: FloorGuard R50 roller coat. A light seal coat: HydroShield WE40. Hot washdown or spillage: PurScreed PC70.
Quoted after inspectionBy industry, across Malaysia
Industries we cover ↗ 04 Rayson system
Car park floors
Basement, covered and open car park decks, ramps and walkways in condos, malls, offices and factories: textured epoxy, UV-stable PU and deck waterproofing.
- FloorGuard R50 sealing coat
- FloorGuard R50 broadcast with graded aggregate
- PrimeBond E20 epoxy primer
- Concrete deck, ground and moisture-tested
Pedestrian walkways: GripSafe AP12. Open top deck: UraForce SB72 over PrimeBond S30. A deck that leaks into the level below: SealForce RC30 under the wearing layers.
Quoted after inspection 05 Rayson system
Warehouse and logistics floors
Forklift aisles, racking zones and loading bays in warehouses and distribution centres, in self-levelling or roller-applied epoxy.
- LevelShield SL120 self-levelling epoxy
- PrimeBond E20 epoxy primer
- Concrete slab, ground, joints and cracks repaired
Racking and storage zones: FloorGuard R50 roller coats. Heavy traffic with spillage: PurScreed PC70. Broken joints and spalls: MortarBond EM90 first.
Quoted after inspection The practical details
Rayson HydroShield WE40: questions people ask
Do I need a separate primer under HydroShield WE40?
Normally no — the first coat acts as the primer and subsequent coats build the finish. Very porous screeds may need an extra priming coat to achieve a full seal.
Is it suitable for basement car parks?
Yes. It is water-based, stated suitable for unventilated areas, and handles the normal to medium-heavy traffic typical of enclosed decks.
Can it be applied to a damp slab?
Dry or damp surfaces are acceptable, provided there is no standing water and moisture content stays within 5%.
How does WE40 differ from WE45?
They are closely related water-based epoxy seal coats. WE45 additionally covers duties such as rubbish chute coatings. Our technical team can advise which suits your exposure.
Will the colour stay stable outdoors?
Like all epoxies it will yellow and chalk under direct UV. For exposed decks, finish with a UV-stable Rayson UraForce polyurethane topcoat.
How many coats does a typical floor need?
Two coats is the usual self-priming build-up; porous substrates may need more. Confirm the build-up for your slab with our technical team.
Start a conversation / ↗
Send the job, or ask for materials
Tell us what the surface is, where it is and what it has to withstand. Rayson replies with a system recommendation; for installation, the applicator for your area in Johor, Kuala Lumpur or Penang is introduced to quote the job.
Malaysia launch: 1 March 2027. Enquiries are welcome now; supply, site assessment and installation timing are confirmed for each project.