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.
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.
A standalone product performs its job in a single application rather than as one layer of a multi-coat system.
The figures below are a guide for planning. Site conditions and workmanship affect results — confirm the details for your project with our technical team.
| 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 & 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 |
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.
Yes. It is water-based, stated suitable for unventilated areas, and handles the normal to medium-heavy traffic typical of enclosed decks.
Dry or damp surfaces are acceptable, provided there is no standing water and moisture content stays within 5%.
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.
Like all epoxies it will yellow and chalk under direct UV. For exposed decks, finish with a UV-stable Rayson UraForce polyurethane topcoat.
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.
Rayson HydroShield WE45 is a two-component, water-based epoxy primer-and-topcoat system for concrete, screed, asphalt and metal — covering duties from warehouse floors to rubbish chute coatings.
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View productTell us your surface, area and timeline — our Singapore technical team will recommend a practical system and price it fast.
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Answers from Rayson's own product information
Guidance only — confirm specifications with the Rayson technical team.