Commercial glass partitions and frameless walls are standard in modern Melbourne offices, and they create a very specific problem for painters: every surface surrounding them demands precision masking, careful product selection and a cutting-in technique that leaves no trace on the glass itself. Get it wrong and you spend more time cleaning up than painting.
Why glass partitions are different from ordinary walls
Standard walls give you a small margin for error. Glass doesn't. Paint mist, overspray and even a loaded brush held too close will leave residue on frameless glass that's visible from the other side of a room. Tinted or frosted glass makes contamination harder to spot during the job and more obvious once the lights go on.
The framing around glass partitions, whether aluminium, powder-coated steel or timber, also matters. Each material has a different surface energy and responds differently to tape adhesion. Pull tape from a powder-coated aluminium extrusion too soon and you lift the coating. Leave it too long and the adhesive bakes on.
Frameless glass walls add another layer of complexity. Without a frame, there's no obvious physical boundary between the wall surface and the glass edge. The silicone bead that seals the glass to the wall is permeable to solvent-borne paints and can discolour if the wrong product hits it.
Masking: the work that determines the result
Proper masking for glass partitions isn't a five-minute job. For a single full-height partition in a typical open-plan office, allow 30 to 45 minutes of masking time per panel before a brush touches the wall.
Use a fine-line masking tape (3M's 218 series works well for most commercial applications) directly against the glass edge or the frame face. Fine-line tape conforms better to uneven surfaces and leaves a cleaner edge than standard painters tape. Back that with a wider tape or masking paper to protect the glass face from roller mist.
For silicone beads on frameless installations, apply tape just inside the bead line rather than over it. Paint bridging the silicone will crack at the joint when the glass or structure moves, which it always does slightly with temperature changes.
Primer and product selection around glass and metal frames
The wall surface adjacent to a glass partition is usually plasterboard, render or a stud-framed structure. These surfaces take standard water-based primer without issue. The challenge is at the boundary.
Aluminium and powder-coated frames need an adhesion primer before any topcoat is applied to them directly. Without it, the topcoat peels at the frame within months, especially in air-conditioned environments where thermal cycling is constant. Dulux's Duramax range includes products formulated for this substrate, and Haymes offers suitable alternatives in their commercial line.
For frameless glass walls where the wall paint runs close to the glass edge, a low-VOC water-based topcoat reduces the risk of solvent migration into the silicone. This matters in occupied spaces too, where managing paint odour in occupied commercial spaces is a genuine operational concern.
Cutting in along glass: technique over speed
Cutting in along a glass partition requires a loaded but not dripping brush, a steady hand and an angle of approach that keeps the bristle tips at the glass line rather than dragging past it. A 50 mm angled sash brush gives the most control.
Work in short strokes, 200 to 300 mm at a time, rather than running a long stroke the full height of the panel. Each short stroke lets you check the edge before the paint films over and hides any bleed. Wipe any bleed immediately with a damp cloth while the paint is wet. Dried paint on glass needs a razor blade, which risks scratching tinted or coated glass.
Don't rely on masking tape alone as a cutting guide. Tape gives you a boundary, not a perfect edge. The brush technique has to meet the tape cleanly, not overlap and pool against it.
Working in occupied offices with glass partitions
Open-plan offices with glass partitions are rarely empty during a repaint. Staff on the other side of the glass can see every move, hear every noise and smell every product used. Planning the sequence of work matters as much as the technique itself.
Start with the sections furthest from active workstations and work inward. Use low-odour, water-based products throughout. If the office is running on normal hours, schedule cutting-in and detail work for early morning and use rollers for open wall areas during quieter periods. The same principles that apply to paint touch-ups in occupied commercial spaces apply here, especially around colour matching existing finishes where new painting meets old.
Glass partitions also transmit noise. Scraping, sanding and tap-tapping of ladders reads clearly on the other side. Brief the client on what to expect and when, and stick to that schedule.
Removing masking and finishing the edges
Pull masking tape at a 45-degree angle back over itself, not straight out from the wall. This pulls the tape away from the paint film rather than through it, reducing the risk of lifting the edge of a fresh coat. Pull while the paint is still slightly tacky, not fully wet and not bone dry. Fully dry paint tears at the edge; fully wet paint smears.
After removing tape, inspect the glass line in raking light. Raking light, a torch or work light held at a low angle parallel to the glass surface, picks up paint haze, smear and any tape residue that daylight misses. Clean glass with a commercial glass cleaner and a lint-free cloth, not paper towel, which leaves micro-scratches on coated glass.
Any touch-ups at the cut line should be done with the same brush used for the original cut, not a foam applicator. Foam applicators leave a different texture than bristle, which is visible on semi-gloss and satin finishes once the light catches it.
What to ask your commercial painter about glass partition work
If you're briefing a commercial painter on a fit-out that includes glass partitions, ask specifically about their masking process and how long they allow per panel. A painter who can't answer that question clearly hasn't done much glass partition work. Ask what tape product they use and whether they've worked with the specific glass type in your space, particularly if it's tinted, frosted or has an applied film.
Getting these details into the brief upfront avoids disputes later about glass cleaning, frame damage or edge quality. For a broader guide on structuring those conversations, how to write a commercial painting brief that gets accurate quotes covers what to include so nothing gets missed.
Glass partition work isn't the hardest part of a commercial repaint, but it's the part that clients notice first. A clean edge on a glass wall signals the same level of care applied everywhere else in the job.