Bostik Waterproofing
The Boscoseal Range Explained (2026)

Who Bostik is

Bostik is a global adhesives and construction-chemicals company — part of the French Arkema group — that most Malaysians first meet through glue, sealants and tile adhesives long before they meet its waterproofing. Its Malaysian operation runs a full local catalogue, and the waterproofing side of it trades under one family name: Boscoseal. Compared with the specification-heavy internationals, Bostik’s Malaysian range is deliberately shelf-friendly — one-part, water-based products in DIY-sized pails, stocked by hardware chains and marketplaces — which makes it one of the easiest branded ranges for a homeowner to actually buy. As always with construction chemicals, the brand is a catalogue, not a product: the RM249 pail and the RM429 pail on the same shelf solve different problems, and this guide sorts them the same way our best waterproofing products guide sorts the whole market — category first, brand second.

The Boscoseal range at a glance

The Malaysian catalogue in one table (product specs vary by datasheet — read the one on your pail).

Boscoseal RC2 — the exposed-roof acrylic

RC2 is the volume seller: a single-component flexible acrylic that brushes or rolls on and cures into a tough elastic film, positioned as an exposed membrane for flat and pitched roofs. It sits squarely in the same class as the viral coatings Malaysians already know — the class our acrylic roof coating guide covers — and the same physics applies: excellent on sound, draining surfaces and small exposed patches; realistic lifespan of a few years on trafficked or ponding decks; and no answer at all to water arriving from behind the surface. Applied at datasheet coverage in two crossed coats with the edges properly coved, an RC2 roof recoat is honest value. Applied as a one-thin-coat miracle over a ponding slab, it joins the long list of failed green roofs the Klang Valley repaints every monsoon.

Boscoseal AC2 — fibre-reinforced membrane

AC2 is the wet-area workhorse: a one-part, water-based acrylic membrane with fibre reinforcement blended in, formulated for internal and external waterproofing — bathroom and kitchen floors before tiling, balconies, and general wet-area work. The built-in fibre gives the cured film more body and crack-bridging than a plain coating, which is why it competes with the two-part flexible cementitious class covered in our flexible membrane guide while staying mix-free and DIY-friendly. The discipline is unchanged: sound clean substrate, two coats at the stated rate, 150–300 mm wall upturns, corners and outlets detailed first, full cure, then a 24–48 hour ponding test before the tiler hides your work — the sequence our bathroom waterproofing guide walks through in full.

The PU tier — PUW and PUR

Above the acrylics sit the polyurethane products. PUW is the interesting one: a one-component, water-based modified PU that cures into a tougher, more elastomeric film than acrylic can manage, while keeping water clean-up — a sensible step up for exposed decks and roofs where you want more durability without moving to solvent-based applicator systems. PUR is the budget bitumen-modified PU membrane — the black pail — suited to protected and general waterproofing where its bituminous character is acceptable, in the same spirit as the class in our bituminous waterproofing guide. Neither is a full applicator-grade PU membrane system of the Sikalastic-632 R kind; they are the strong middle of the DIY-to-trade spectrum, priced accordingly.

Sheets, anti-root & admixtures

The rest of the catalogue rounds out the system. Boscoseal 16 is a self-adhesive sheet membrane — peel-and-stick waterproofing for details and small areas without torching, a gentler cousin of the class in our torch-on membrane guide. Boscoseal AR adds root resistance for planter boxes and landscaped decks — a real Malaysian condo problem, as anyone whose planter box has fed a downstairs stain knows. ADMIX is a crystallisation admixture dosed into fresh concrete or screed, buying integral water resistance on new work, and the F-100 fibreglass mat reinforces liquid membranes at cracks and junctions. These ancillaries matter more than they look: a coating quoted without its reinforcement and detailing is a coating priced to fail.

Bostik prices in Malaysia (2026)

Indicative 2026 Klang Valley retail, from hardware and marketplace listings — expect movement by store, colour and pack.

For context, professional supply-and-apply work in the Klang Valley runs RM6–RM18 per sq ft for membrane systems — the pail is typically a quarter or less of a real job’s cost, with prep and labour carrying the rest; see the full market tables in our waterproofing cost guide.

Which Boscoseal for which job

Bostik vs Sika, Pentens & Mapei

Where does Bostik sit in the Malaysian brand landscape? Broadly: more DIY-accessible than Sika’s applicator tier, more range depth than Pentens’ famous single tub, and less tiling-system integration than Mapei. If your job is a self-applied coat on a reachable surface, the Boscoseal shelf is as good a starting point as any of the big names — at this tier, application discipline outweighs the logo, a point our Sika guide and Pentens T-200 guide both land on. If your job is a specified roof system or a tiled wet-area rebuild, the comparison shifts to systems and applicators rather than pails — our Sika vs Pentens vs Mapei comparison runs that contest category by category, and the full market map lives in our waterproofing brands guide.

Where Bostik jobs go wrong

The failure stories are the coating class’s usual suspects, not the brand’s. RC2 stretched to half its rated thickness because one pail “looked enough”. AC2 stopped at the wall line with no upturn, so the wall-floor junction — the most common leak path in Malaysian bathrooms — stayed bare. Coating over dust, algae or flaking old layers. Flooding the floor the same evening because it felt touch-dry. And the expensive one: buying any of these pails to fix a ceiling stain from below, where the water is inside the slab and no surface film survives. If a Boscoseal coat has already failed on your job twice, the product is not the variable — the problem class is, and the next ringgit belongs on a diagnosis, as our why waterproofing fails guide explains.

Why ClickBina

ClickBina works with branded systems across the Malaysian market — Boscoseal-class acrylics and PUs included — and applies them with the discipline that makes any brand work: prep to sound substrate, datasheet coverage, detailed corners and outlets, cure time and a ponding test. 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. Standing in the hardware aisle unsure which pail — or whether a pail fixes it at all? WhatsApp us a photo of the job and we will tell you straight.