Sika’s liquid-membrane line mapped grade by grade — which Sikalastic belongs on your roof, balcony or bathroom, real Malaysian prices, and when the job needs an applicator.
Sikalastic is not one product — it is the product line Sika uses for its liquid-applied waterproofing membranes, the same way Sikaflex names the sealants. Everything wearing the name shares one idea: a liquid you roll or brush cold onto a roof, balcony or wet area, which cures into a seamless, elastic, fully-bonded waterproof skin with no lap joints and no torch. Within that idea the line spans very different chemistries — one-part polyurethanes for exposed roofs, waterborne acrylic-class coatings, and even fibre-reinforced cementitious membranes at the retail end — at prices a full order of magnitude apart. If you are still deciding whether Sika is the right brand at all, start with our Sika waterproofing guide, which maps the whole catalogue by category; this page goes deep on the membrane line specifically, because “Sikalastic” is what actually ends up written on Malaysian roofing quotes.
Product availability shifts with distributor stock, but these are the Sikalastic grades Malaysian buyers actually meet, sorted by what they are (specs vary by product and datasheet — always read the one on your pail).
| Grade | Chemistry | Tier | Where it fits |
|---|---|---|---|
| Sikalastic-632 R | 1-part PU, rapid moisture-cure | Applicator | Exposed flat roofs, decks — crack-bridging, UV-stable |
| Sikalastic-560 | 1-part waterborne, elastic, UV-resistant | Project / spec | Economical exposed-roof membrane on larger jobs |
| Sikalastic-590 | PU-hybrid roof coating | Applicator / advanced DIY | Roof recoats and refurbishment |
| Sikalastic-501 Roofseal Plus | Elastic roof coating | Retail | Small roofs, awnings, maintenance recoats |
| Sikalastic-1K | Fibre-reinforced cementitious, 1-part | Retail | Bathrooms, balconies, tanks — under tiles |
| Sikalastic-152 | 2-part flexible cementitious mortar | Applicator / trade | Wet areas and facades needing crack-bridging slurry |
The pattern to hold onto: the PU grades live on exposed roofs, the cementitious grades live under tiles, and the coating grades live in between as maintenance skins.
Sikalastic-632 R is the grade Malaysian contractors specify most: a one-part polyurethane that cures with atmospheric moisture — usefully fast in our humidity — into a tough, elastic, UV-stable membrane that bridges hairline cracks and survives ponding far better than acrylic coatings. It is the honest answer for exposed RC flat roofs, the problem surface our flat roof waterproofing guide covers in depth. Sikalastic-560, its waterborne sibling, trades some toughness for economy and typically appears on larger specified projects through Sika’s project channel rather than the hardware shelf. Both are genuine membrane systems, not paint: they expect a primer matched to the substrate, reinforcing fleece at cracks, outlets and upstands, and a measured film thickness built over multiple coats — which is why they are usually sold with an applicator attached.
At the hardware-store end sit two very different products sharing the family name. Sikalastic-1K is a one-part, fibre-reinforced cementitious membrane — mix with water, brush on, and it cures into a flexible slurry coat; it competes with the flexible-cementitious class we map in our flexible membrane guide and is the Sikalastic you want under tiles in a bathroom or balcony, not on an exposed roof. Sikalastic-501 Roofseal Plus is the opposite: an elastic roof coating in DIY-sized pails for awnings, porch roofs and maintenance recoats — a legitimate light-duty skin, with the same honest limits as every coating class we cover in the acrylic roof coating guide. Neither retail grade turns a failed slab into a dry ceiling; they are surface systems for surfaces you can reach.
Indoors and on balconies, the Sikalastic name usually means the cementitious grades — 1K for straightforward wet-area work and the 152-class two-part mortar where more crack-bridging is wanted. Both go over prepared screed and up the walls before tiling, exactly the sequence our bathroom waterproofing guide walks through. On balconies, the deciding question is exposure: a tiled, drained balcony is cementitious-membrane territory, but a balcony slab left exposed to sun and ponding wants the PU tier instead — the decision logic is in our balcony waterproofing guide. What Sikalastic of any grade cannot do is stop water already moving through the slab from above: that is negative-side territory, and the honest fix is PU injection — RM650 flat per bathroom ceiling with ClickBina — not another coat below, as our injection vs membrane guide explains.
Liquid membranes are bought by coverage, not by pail count guesswork. Datasheet rates vary by grade, but the arithmetic below is the sanity check we run on every quote (verify against the datasheet on your actual product).
| Job | Typical grade | Realistic coverage logic |
|---|---|---|
| 400 sq ft exposed flat roof | 632 R class | 2–3 coats to full film build — multiple 21 kg pails plus primer and fleece at details |
| Porch / awning recoat | 501 Roofseal Plus | 2 crossed coats; a 20 kg pail covers a small roof, 4 kg suits patches |
| Standard bathroom before tiling | 1K | 2 coats, floor plus 150–300 mm wall upturns — one 20 kg pack is usually close |
| Balcony with upstands | 1K / 152 class | 2 coats plus corner detailing; never stretch a pail to avoid buying a second |
The universal trap is stretching coverage: a membrane is only a membrane at its designed thickness, and a pail spread over double its rated area is the most expensive thin paint in Malaysia.
Malaysian retail prices below are indicative 2026, Klang Valley, gathered from hardware and marketplace listings — expect movement by store, colour and stock (applicator-tier products often ship through project channels at negotiated prices).
| Product | Pack | Indicative retail price |
|---|---|---|
| Sikalastic-1K | 20 kg | RM320 – RM375 |
| Sikalastic-1K | 12 kg | RM185 – RM200 |
| Sikalastic-501 Roofseal Plus | 4 kg | RM185 – RM205 |
| Sikalastic-501 Roofseal Plus | 20 kg | RM820 – RM950 |
| Sikalastic-590 | 20 kg | RM750 – RM1,200 |
| Sikalastic-632 R | 21 kg | RM980 – RM1,500 |
Material is only part of the bill: applied liquid-membrane work in the Klang Valley lands around RM6–RM18 per sq ft supply-and-apply depending on system and detailing — the full market maths is in our roof waterproofing cost guide and the site-wide waterproofing cost guide.
A proper Sikalastic roof job follows the same discipline whatever the grade: the deck is cleaned and ground to sound concrete, cracks and spalls are repaired first, and moisture is checked before anything opens. Primer goes down matched to the substrate. Details come before the field — outlets, upstands, pipe penetrations and live cracks get coated and fleece-reinforced individually, because that is where every roof actually leaks. Then the field coats: two or three passes at the datasheet rate, each within the recoat window, crossed in direction, building to the specified film thickness. Finally cure time is respected and the roof is ponded or hose-tested before handover. None of this is Sikalastic-specific — it is what liquid membrane systems demand, and our liquid membrane guide covers the method class in full — but it is exactly the part a ninety-second product video never shows.
The retail grades — 1K on a bathroom floor, Roofseal Plus on a porch — are genuinely DIY-able if you bring the discipline: real prep, datasheet coverage, corner detailing, cure time, ponding test. The applicator grades are a different proposition. A 632 R-class PU membrane costs four figures per pail, punishes moisture and thickness mistakes, and its warranty story assumes trained application; buying it to save on labour is how a RM3,000 material bill becomes a RM3,000 mistake. Our rule of thumb: if the surface is small, reachable and yours to experiment on, DIY a retail grade; if it is an exposed roof over rooms you live in, price the applied system — and vet the applicator with the checklist in our waterproofing contractor guide. The DIY vs contractor guide runs the full decision honestly.
When a Sikalastic surface fails early in Malaysia, the chemistry is almost never the culprit. The recurring failures: the wrong grade for the exposure — a cementitious 1K coat left exposed on a ponding roof, or a light coating asked to do a PU membrane’s job; coverage stretched until the film is decorative; primer and fleece details skipped to save a morning, so the membrane fails at the outlet it was never sealed to; coating over dust, algae or a previous flaking layer; and tiling or flooding before cure. One more that costs Malaysians real money: coating the ceiling below a leak with a surface product — the water is inside the slab, and the film simply blisters off. The full failure taxonomy lives in our why waterproofing fails guide; the short version is that application discipline, not the pail, decides the outcome.
ClickBina applies liquid-membrane systems — Sikalastic-class PU and cementitious grades among them — with the discipline the datasheet assumes: ground prep, moisture checks, fleece-reinforced details, measured coverage and a ponding test before handover. Flat itemised quotes across the Klang Valley, PU injection at RM650 flat per bathroom ceiling, and a 6-Month No-Leak Warranty on injection work. Quoting a Sikalastic roof, or holding a pail and second-guessing the job? WhatsApp us a photo — we will tell you honestly which grade fits, or whether your leak needs a different fix entirely.
Tell us what you need — we reply within the hour.