Yes
Over sound, bonded tile
De-Gloss
The step most often skipped
Mesh
Bridges every grout line
5 Days
Typical bathroom on site
Preparing a Tiled Surface
Can you micro cement over tiles? Yes. First check the surface for loose tiles, then clean and degrease it, de-gloss it mechanically and fill the grout lines. A bonding primer for non-absorbent surfaces then goes down before the first coat.
People usually ask can you micro cement over tiles expecting a warning. A tiled wall or floor is flat, rigid, well fixed and dimensionally stable. Those are the four things a two to three millimetre coating needs from a substrate, which is why coating over tile is a sound method rather than a shortcut.
Preparation starts with a survey rather than a bucket. We tap every tile and listen. A hollow, drummy note means the tile has lost its bond to the bed beneath, and no coating will hold a tile that is already letting go. Those come off, and we make the area good and level it before anything else happens.
Movement is the other check. Wall tiles on masonry are stable. Floor tiles over a timber substrate that flexes underfoot are not, and that flex will find its way through a thin coating as a crack. We assess this on site and say plainly when a floor needs work first.
The survey comes before the trowel. A coating cannot hold down a tile that has already lost its bond.
Cleaning and De-Glossing
These are two separate jobs and both are non-negotiable. One removes what is on the surface, the other changes the surface itself.
Clean and Degrease
Soap film, limescale, cleaning residue and body oils all sit invisibly on tile and all break adhesion. So we wash the surface back thoroughly, rinse it, and let it dry.
Mechanically De-Gloss
Manufacturers engineer glazed tile to shed water and resist adhesion. Abrading the glaze therefore gives the primer a physical key instead of asking it to grip a sealed, polished face.
Fill the Grout Lines
We fill and level deep or wide joints so the coating sits on one plane. Combined with mesh in the base coats, this is what stops the tile grid ghosting through months later.
De-glossing is the step most often skipped on a fast job, because a cleaned tile already looks ready. It is not. The glaze is the exact property the coating has to overcome, and leaving it intact is the single most common cause of a microcement floor or wall lifting a year later.
Applying the Right Primer
Whether you can micro cement over tiles successfully often comes down to this step alone. Primer is not a formality on tile, and the wrong one will undo everything done before it. Manufacturers formulate standard plaster and render primers for absorbent substrates. Tile absorbs nothing, however, so those primers sit on the surface and dry as a film rather than keying into anything.
01
Quartz Loaded Primer
The specification for non-absorbent substrates. Suspended quartz leaves a fine mechanical tooth for the base coat to grip.
02
Correct Cure Window
Every primer has a window in which the next coat must go on. Too early and it is still soft, too late and the tooth has closed off.
03
Full, Even Coverage
A missed patch becomes a debonded patch. We therefore check coverage in raking light before loading the first base coat.
04
Wet Area Sequencing
In showers the waterproof membrane behind the tile must be sound. The primer and coating sit above it and never replace it.
Once primed, we bed a fibreglass mesh into the first base coats across the whole area, bridging grout lines and movement points. Finish coats and multiple sealer coats then follow. Our microcement bathroom page covers wet area work in detail, and the microcement services page sets out the systems we apply.
Why Professional Application Is Crucial
So can you micro cement over tiles yourself? The materials are not hard to buy. What is hard is that almost every failure point sits in preparation and timing rather than in trowel skill, so the mistakes are invisible until the job is finished and cured.
Step by step
- Adhesion needs judgement, not guesswork: Knowing which tiles are sound, which glaze needs abrading and which substrate is moving is a survey skill built over many bathrooms.
- Primers need specifying, not picking: Substrate, location and coating system decide the primer. Getting this wrong is the most common cause of a coating lifting.
- Cure windows are unforgiving: Each coat has a window in which the next must follow. Miss it and adhesion between layers suffers invisibly until it fails.
- Wet areas carry compliance: Membranes behind tile must meet Australian standards. A coating over a suspect membrane hides a problem rather than solving it.
- Repairs cost more than the job: Stripping a failed coating means removing the tiles it was meant to save, which is the demolition you were avoiding.
Done properly, a microcement surface over tile lasts and can be spot repaired in place. Done quickly, it becomes a more expensive version of the renovation you were trying to avoid.
Frequently Asked Questions
Common questions about applying microcement over tiles, answered by our in-house team.
Do the tiles have to come off first?
No. Sound, well bonded tile is close to an ideal substrate: flat, rigid and already fixed. Only loose or drummy tiles need lifting and making good. That is the whole point of the method.
What happens if the tiles are not de-glossed?
The primer has nothing to key into, so the coating bonds to a glaze rather than to the substrate. It may look right for months and then lift at an edge or under thermal movement. De-glossing is not an optional step.
Will the grout lines show through later?
Not when we fill and level the lines and bed a mesh into the base coats. Ghosting on other jobs almost always signals that someone skipped one of those two steps to save a day.
Can I do this myself?
The materials are available, but the failure points are all in preparation and timing rather than in trowel skill. Adhesion, de-glossing, primer choice and cure windows are where DIY attempts usually come undone.
