Rayson SealForce WB20 is a one-part, water-based, polyurethane-modified waterproofing membrane for toilets, showers, bathrooms, balconies and other interior wet areas — rolled or brushed on in two coats and concealed beneath the tiles, screed or render.
SealForce WB20 is Rayson's one-part wet-area membrane: a water-based, polyurethane-modified liquid that is stirred and applied straight from the pail, with no mixing ratio to get wrong and no solvent odour in a closed bathroom. Two coats at 0.4 mm wet film each dry to a seamless, flexible green film that follows the floor into the trap, up the wall turn-ups and around every pipe as one continuous membrane.
The cured film is elastic — elongation of at least 150% and crack-bridging over a 2 mm crack — so it takes the small movement and vibration a floor sees without splitting, and it keeps its strength after heat ageing and immersion in hypochlorite, ammonia and dilute acid. Water penetration under pressure is nil at the specified film build.
It is a concealed membrane by design. Once the ponding test has proved the film, the screed, render or tile bed above protects it; it is not a wearing surface and not for exposed or negative-pressure service. Where a deck must carry vehicles or a roof stays open to the sun, the polyurea membranes in the SealForce range take over.
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 enquiry| Specification | Data sheet value |
|---|---|
| Coverage | Approximately 0.56 kg/m² per coat at 0.4 mm wet film (about 1.8 m² per kg); a 20 kg pail covers about 36 m² per coat, or about 18 m² at two coats, subject to substrate condition |
| Mixing | One part — stir gently before use and apply straight from the pail; do not dilute and do not add sand |
| Drying and curing | Touch dry in under 60 minutes; first coat dry in 1–2 hours, second coat in about 4 hours depending on temperature and humidity; ponding test 24 hours after the final coat |
| Pack sizes | 20 kg plastic pail |
Rayson-authorised applicators in Johor, Kuala Lumpur and Penang install Rayson SealForce WB20 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.
Order it direct, with a step-by-step guide
SealForce AC10 acrylic, RC40 polyurea and WB20 wet-area membrane, sold direct with the coverage and a step-by-step guide.
Flat roofs and decks that are walked on: SealForce RC40 polyurea. Toilets, under the tiles: SealForce WB20.
Quoted per orderJobs in Johor
The membrane under the tiles, done once and flood-tested before the tiler starts.
Read the stain first: toilet above, roof, pipe or wall each need a different repair.
Under a roof: a roof membrane instead. A steady drip in any weather: a plumber first.
Quoted after inspectionSurfaces that are rained on and walked on, with a room underneath that must stay dry.
Under new tiles: SealForce WB20 beneath a protected screed.
Quoted after inspectionSeamless cement finish over floors, walls and showers, with Rayson waterproofing underneath where it is wet.
Dry floors: PrimeBond E20 primer in place of the membrane, or a bonding primer over firmly bonded tiles.
Quoted after inspectionThe polished concrete look over your existing floor or wall, without breaking it out: the IFS overlay on a prepared base.
Wet areas: the applicator confirms whether a SealForce WB20 membrane goes underneath first.
Quoted after inspectionJobs in Kuala Lumpur and Selangor
Kuala Lumpur and Selangor ↗Condo and landed-home bathrooms in the Klang Valley re-waterproofed with SealForce WB20 under the tiles, ponding-tested before anything goes back.
Seamless instead of tiles: IFS MicroCrete® over the same ponding-tested WB20, confirmed on a sample first.
Quoted after inspectionBy industry, across Malaysia
Industries we cover ↗Corridors, service areas, kitchens, laundries, wet rooms, ramps and car parks in hospitals, clinics and care homes, laid in occupied buildings.
Corridors and service areas: LevelShield SL120 or FloorGuard R50. Kitchens and laundries: PurScreed PC70. Walls: UraForce WB58.
Quoted after inspectionClassrooms, corridors, halls, walkways, playgrounds, toilets, canteens and roofs in schools and kindergartens, done in the school holidays.
Walkways, ramps and playgrounds: GripSafe AP12. Toilets: SealForce WB20 under the tiles.
Quoted after inspectionDecorative finishes in KL, Selangor and Penang
The IFS partner range ↗Seamless IFS MicroCrete® for condo bathrooms, floors and walls, with Rayson waterproofing under every wet area.
Dry rooms: PrimeBond E20 on concrete or screed, or a bonding primer over firmly bonded tiles, in place of the membrane.
Quoted after inspectionThe polished concrete and simen kilat look over the floor you already have: the IFS overlay, or IFS’s polished concrete slab for a new floor.
A new floor: IFS polished concrete slab, at least 25 mm (IFS). Wet areas: the applicator confirms whether SealForce WB20 goes underneath first.
Quoted after inspectionNo. It is a one-part membrane applied directly to a sound, clean, dry concrete or rendered substrate — there is no separate primer in the system. Preparation does the primer's job: remove loose material, curing compounds and protrusions, and let old concrete dry fully after washing. SealForce AP05, the acrylic primer in the range, belongs to the SealForce AC10 roof and wall system, not to WB20.
At least two coats at 0.4 mm wet film each, rolled or brushed straight from the pail, the second 1–2 hours after the first. Add a third coat where the film is uneven or pinholes remain. A 20 kg pail covers about 36 m² per coat.
Only after the ponding test, 24 hours after the final coat, has proved the membrane — and always through the screed, render or tile bed that protects it. The membrane is not a wearing surface and must never be left exposed. Rayson SealForce RW1 can be mixed into that screed, render and tile bed to make them stronger and more water-resistant.
WB20 is a one-part, water-based membrane for concealed wet areas — toilets, bathrooms and balconies beneath tiles — chosen for ease of use and low odour in occupied homes. RC30 is a two-component polyurea-based membrane with higher elongation and heat resistance for decks, roofs and heavier-duty wet areas.
No. SealForce WB20 is a positive-side membrane and must not be used where negative hydrostatic pressure is evident, such as a basement wall with groundwater behind it. Those conditions need a tanking or crystalline system designed for them.
Each coat is touch dry in under 60 minutes at laboratory conditions; the second coat goes on 1–2 hours after the first and is dry in about 4 hours. The flood (ponding) test is carried out 24 hours after the final coat, with light foot traffic only, and the screed or tile bed follows once the test has held. In a typical HDB toilet the membrane is one day of work and the test the next.
No. It is a concealed membrane applied to the prepared screed or concrete beneath the tiles, not a coating over them. If the bathroom has failed an HDB or HIP water test, water is already under the tiles and no surface-applied product reaches the failed detail: the tiles come up, the substrate is prepared, and WB20 is applied in two coats and flood-tested before re-tiling. The wet-area guide sets out when a no-hack repair is honest and when it is not.
The product by name — Rayson SealForce WB20 — two coats at 0.4 mm wet film each (about 0.56 kg/m² per coat), the turn-up height on every wall and at the door threshold, the detailing at the floor trap, pipe penetrations and wall–floor junction, a 24-hour flood test before tiling, and who carries which warranty: the applicator for workmanship, Rayson for the material, three years against manufacturing defects when applied per the TDS. A quotation that says only "waterproofing" cannot be compared with another.
About 8 to 12 kg for two coats over a typical 3 m² toilet floor with 300 mm turn-ups and a shower wall taken to 1.8 m — under one 20 kg pail, which covers about 18 m² at two coats. Detailing, a third coat on thin patches and wastage set the actual figure; the coverage calculator gives the theoretical quantity for any area.
Rayson does not publish a service-life figure for a concealed membrane: the tile bed protects the film, and it is the details that fail, not the field. What the data shows is retention — at least 1.0 N/mm² tensile strength and 120% elongation after ageing at 50 °C and after 72 hours in hypochlorite, ammonia or dilute acid. A bathroom lasts as long as its trap, penetrations and turn-ups were done correctly and flood-tested before the tiles went down.
SealForce WB20 is part of Rayson's upcoming waterproofing release, and a pre-launch trial batch has already been applied and flood-tested in a Singapore HDB toilet. Send the project details and your required date, and Rayson will confirm supply timing, quantities and, where you need one, an applicator in the Rayson network before you commit.
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.