Self-priming — one product serves as primer and topcoat
Coloured seal coats on cementitious screeds
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.
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.
Real product · Interactive depth view Rayson HydroShield
Product system Rayson HydroShield WE40
Part A 4 kg / Part B 1 kg, or Part A 16 kg / Part B 4 kg per set RY-TDS-301
Rayson HydroShield WE40 has one clearly defined, verifiable job in the coating system.
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.
Water-based and suitable for unventilated areas
Warehouse flooring and production floors in normal to medium-heavy exposure
Applies to dry or damp surfaces
Car park deck coatings
Prime and finish with one system.
A self-priming water-based epoxy for coloured protection on dry or damp floors where low odour matters.
A controlled route to applying Rayson HydroShield WE40.
This sequence supports early planning. It does not replace the current Technical Data Sheet, approved method statement or project-specific technical review.
- 01
Inspect and prepare the substrate
New and existing concrete (minimum 28 days old, moisture content below 5%)
- 02
Prepare the material as specified
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
- 03
Apply with the correct tools
Recommended methods: Roller, Brush, Airless spray. Confirm coat count and thickness for the project.
- 04
Protect through the required cure
Final cure 7 days
Coating system cutaway
Every layer has a job—from prepared substrate to service surface.
This diagram explains a typical system position, not a fixed specification. Primer, body coat, finish, thickness and detailing must be confirmed for the project.
Position in the system Standalone coating
Rayson HydroShield WE40 serves as the standalone coating. Confirm the complete build-up against the substrate, exposure and project requirements.
Related system products
Review primers, body layers, finishes or specialist components connected to this product.
- Rayson HydroShield WE40Standalone coating · Water-based epoxy
- Compatible body coat / baseProvides the required thickness and continuity beneath the finish
- Approved primer / baseIncluded when required by the system design
- Correctly prepared substrateNew and existing concrete (minimum 28 days old, moisture content below 5%)
Four project facts for faster system screening.
These current product figures support early selection. Confirm the final build-up, quantity and application conditions against the Technical Data Sheet and site conditions.
- Coverage
- Coverage
- Mixing & working time
- Mixing
- Drying & curing
- Curing
- Pack configuration
- Pack
6–8 m² per kg per coat, varying with substrate condition
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
Final cure 7 days
Part A 4 kg / Part B 1 kg, or Part A 16 kg / Part B 4 kg per set
Confirm the substrate and real service environment before specifying.
Choose it when
- 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
Relevant applications
Concrete Floors Cement Screeds Warehouses & Manufacturing Areas Car Park Decks Offices & Retail Areas
Relevant industries
Choose something else when
- 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
- 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
Other Rayson products to evaluate
These links continue the comparison; they are not automatic substitutes. Confirm the substrate, exposure and complete build-up before selection.
Substrate requirements+
- New and existing concrete (minimum 28 days old, moisture content below 5%)
- Cementitious screeds, including highly absorbent substrates
- Asphalt
- Metal (mechanically prepared)
- Dry or damp surfaces (no standing water)
Technical documents and project support
Ready to specify Rayson HydroShield WE40? Give Rayson the site conditions.
Send the area, substrate condition, expected traffic or exposure, required finish and programme. The technical team can help review the system build-up and estimated quantity.
What to know before specifying Rayson HydroShield WE40.
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.
Related products
Finish HydroShield
Rayson HydroShield WE45
Floors, walls & difficult details
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.
Prime PrimeBond
Rayson PrimeBond W10
Single-pack · water-based
Rayson PrimeBond W10 is a one-component, water-based acrylic primer, sealer and bonding agent for smooth concrete and mineral substrates, applied ahead of Rayson UraForce water-based topcoats.
Finish UraForce
Rayson UraForce WB58
Water-based polyurethane finish
Rayson UraForce WB58 is a two-component, water-based aliphatic polyurethane dispersion topcoat, crosslinked with a PUR hardener, for abrasion-resistant coloured finishes on concrete, metal and mineral surfaces.
Body FloorGuard
Rayson FloorGuard R50
Smooth or anti-slip finish
Rayson FloorGuard R50 is a two-component, solvent-free high-solids epoxy floor coating that cures to a smooth gloss — or a slip-resistant finish when broadcast with aggregate — for concrete and screed under normal to medium-heavy wear.