Rayson SealForce RC40 is a two-component, cold-applied aliphatic polyurea waterproofing membrane for exposed roofs — roller-, brush- or spray-applied, UV-stable and walkable, with certified cool-roof reflectance.
SealForce RC40 is Rayson's cold-applied roof waterproofing membrane: a two-component, aliphatic (polyaspartic) polyurea that brushes, rolls or sprays onto a primed roof and cures to a seamless elastic film. Because the polymer is fully aliphatic, it holds its colour and gloss under direct sun where ordinary aromatic membranes darken.
The cured membrane bridges cracks, shrugs off ponding water with effectively zero uptake, and stays flexible from -35 °C to +80 °C, so it moves with the roof through daily thermal cycling instead of splitting. In its white shade it is a certified cool-roof surface — high solar reflectance that keeps the slab and the space below it cooler.
It bonds to concrete, cement tiles and screeds, metal, and directly over sound bitumen, PVC/TPO single-ply or older liquid membranes and PU-foam insulation, each with the appropriate primer. Corners, drains and cracks are reinforced with polyester fabric bedded wet-on-wet.
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 | 1–1.2 kg/m² total over two layers on cementitious surfaces |
| Mixing | Two parts mixed 13:8 (A:B) by weight; stir Part A ~1 minute, then combine and low-speed mix ~3 minutes until homogeneous; apply undiluted in at least two layers |
| Drying and curing | Touch/recoat ~18 h at 23 °C; resists early rain after 3 h; full hardening ~7 days |
| Pack sizes | Sets (A+B) of 21 kg and 5.25 kg |
Rayson-authorised applicators in Johor, Kuala Lumpur and Penang install Rayson SealForce RC40 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
Flat concrete, tiled and metal roofs: the cause found first, then a membrane over the whole roof.
Flat roofs that pond or are walked on: SealForce RC40 polyurea.
Quoted after inspectionRead 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 inspectionLarge flat and metal roofs in Johor’s industrial parks, coated without stopping production.
Metal and free-draining roofs: SealForce AC10, over an anti-corrosion primer on metal or AP05 on concrete.
Quoted after inspectionNatural pebbles in clear resin for car porches, paths and pool surrounds, with the waterproofing underneath done first.
Jobs in Kuala Lumpur and Selangor
Kuala Lumpur and Selangor ↗Flat roofs, porch roofs, tiled roofs and factory metal roofs in the Klang Valley: the leak traced, then the Rayson membrane that suits the roof.
Roofs that drain freely and old roof tiles: SealForce AC10 over AP05 primer. Metal roofs: AC10 over an anti-corrosion primer, with fleece at the laps.
Quoted after inspectionBy industry, across Malaysia
Industries we cover ↗ESD floors, plant rooms, loading bays, car parks and roofs for data centres in Johor and across Malaysia.
Plant rooms and loading bays: LevelShield SL120. Car parks: FloorGuard R50 broadcast system. Roofs: SealForce RC40.
Quoted after inspectionAliphatic (polyaspartic) polyurea keeps its colour and surface under ultraviolet light, where aromatic polyureas darken over time. On an exposed roof in Singapore sun, that UV stability keeps a cool-roof surface reflective and looking right for years.
No. Unlike hot-spray polyureas, RC40 is cold-applied by roller, brush or airless spray in at least two layers, so it suits ordinary roofing works and detail-heavy roofs without a heated plural-component rig.
Yes, over sound bitumen, PVC/TPO single-ply, PU-foam insulation or old liquid membranes, each with the correct primer and after proper preparation. A failing or debonding membrane must be dealt with first.
In the white shade it has a high solar reflectance and infrared emittance, reflecting sunlight instead of absorbing it. That lowers roof-surface and internal temperatures and can contribute to green-building credits.
It resists early rain about 3 hours after application, with full hardening in roughly 7 days. Timings lengthen in cool, humid conditions and shorten in heat.
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.