Rayson SealForce RW1 is a one-part latex waterproofing and bonding additive for cement-based work — mixed into renders, screeds, slurry coats, tile adhesives and grout to cut water penetration, strengthen the mortar and improve its bond and flexibility.
SealForce RW1 is a milky-white polymer latex that goes into a cement mix in place of some or all of the mixing water. As the cement sets, the latex fills the pores and binds the paste, so the render, screed, slurry or grout takes up less water, bonds harder to the surface behind it, bends further before it cracks and dusts less.
One liquid covers most of the cement work on a waterproofing or renovation job: water-resistant renders, plaster and screeds; a slurry coat that seals the surface and bonds new render, screed or tiles to old concrete or existing tiles; a strengthened mortar or adhesive for ceramic and homogeneous tiles, marble, granite and natural stone; tile grout with a better bond and water resistance; and an injection that re-bonds hollow plaster and screed.
RW1 waterproofs the cement layer it is mixed into, but a cement layer is rigid and does not bridge a crack that moves. Where the waterproofing must stay intact as the structure moves — a toilet, bathroom or balcony under tiles, a flat roof, a planter — the membrane is SealForce WB20, AC10 or RC30, and RW1 waterproofs and strengthens the screed, render, tile bed and grout around it.
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 | Set by the mix rather than the area: in a slurry coat or thin-set tile mortar, 1 part RW1 to 1 part cement and 1 part sand by volume; in renders, screeds and grout, RW1 diluted 1:1 with water in place of the mixing water; as a primer or sealer, RW1 diluted with up to an equal volume of water. Rayson estimates the quantity for each job |
| Mixing | One part. Stir before use, then mix it in at the stated ratio by volume; use fine sand under 0.5 mm for thin-set mortar and grout. Add no extra water beyond the stated dilution |
| Drying and curing | Lay render, screed or tiles onto a slurry coat while it is still wet, never over a dried slurry. Grout 24 hours after tiling; the tiled area can be used 24 hours after grouting. Protect fresh work from rain, direct sun and drying wind |
| Pack sizes | 20 kg pail |
Rayson-authorised applicators in Johor, Kuala Lumpur and Penang install Rayson SealForce RW1 on these jobs; its layer is marked in each build-up. Each page shows how the work runs, what to send for a quotation and what decides the price.
Jobs 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 inspectionDamp, peeling, mouldy walls: rain through the render, rising damp or a leak next door.
Water from a wet area behind the wall: that room is re-waterproofed instead.
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 inspectionIFS Japanese terrazzo, poured in place, for homes, lobbies and shops, on a base prepared with Rayson materials.
Jobs 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 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 inspectionIFS Japanese terrazzo, poured in place with no grout lines, for homes, lobbies and shops, on a base prepared with Rayson materials.
It is mixed into cement-based work to make it more water-resistant, stronger and better bonded: renders, plaster and screeds; slurry coats that seal a surface and bond new work to old; tile adhesives and thin-set mortar, including tiles over existing tiles; tile grout; and patching and re-pointing. Diluted, it is also a primer and sealer for absorbent cement surfaces, and an injection that re-bonds hollow plaster and screed.
Yes, for cement work: mixed into a render, screed, slurry coat, tile bed or grout, it cuts water penetration and makes the layer denser and stronger. What it cannot do is bridge a crack that moves, so where the waterproofing has to survive movement — a toilet, bathroom or balcony under tiles, a flat roof or a planter — the membrane is SealForce WB20, AC10 or RC30, and RW1 waterproofs and strengthens the cement layers around it.
By volume. Slurry coat or thin-set tile mortar: 1 part RW1, 1 part cement and 1 part sand, with fine sand under 0.5 mm for thin-set work. Renders, screeds and grout: RW1 diluted 1:1 with water, used in place of the mixing water. Primer or sealer: RW1 diluted with up to an equal volume of water and rolled onto a clean surface. Add no extra water.
Yes, if the old tiles are sound and firmly bonded: replace any hollow ones, clean, degrease and abrade the glaze, brush on an RW1 slurry coat and bed the new tiles while it is still wet. Trial the bond on very smooth or polished tiles first. Overlaying is also how a new HDB flat is re-tiled in its first three years, when hacking the bathroom tiles is not allowed.
Grout 24 hours after tiling; the tiled area can be used 24 hours after grouting. Lay render, screed or tiles onto a slurry coat while it is still wet, never over a dried slurry.
Yes. Clean and roughen the old surface, remove paint and contaminants, brush on a slurry coat of 1 part RW1, 1 part cement and 1 part sand, and place the new render, screed or concrete while the slurry is still wet.
RW1 strengthens cement-based patching, render and re-pointing — the economical repair for floors, walls and plaster. PatchBond TX80 is a two-component epoxy repair compound for higher-strength, non-sag repairs on vertical, overhead or mat-damp concrete.
SealForce RW1 is part of Rayson's upcoming waterproofing release. 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.