Can you put microcement over laminate and vinyl?

Yes, microcement goes over laminate and vinyl. It has to be the Reinforced system — primer, fiberglass mesh, build coat, microcement, sealer — because these are floors, and any floor that is not bare concrete is Reinforced.

But this is the substrate where we will most often tell you to think about lifting it first. Not always. Sometimes going over the top is the right call. It depends on two things: whether the primer can get a grip on the face, and whether the planks are locked down or floating.

Here is how to work out which situation you have.

Why it is Reinforced, without argument

The Core system covers interior walls, bare concrete floors and indoor fireplaces. Laminate and vinyl are none of those. They are a manufactured layer sitting on top of something else, which is precisely the case Reinforced exists for.

The mesh and build coat are what makes it work. Fiberglass mesh is stapled or glue-gunned over the primed surface and pulled tight, then the build coat is troweled into it so the mesh is buried rather than sitting underneath. Mesh bedded in a structural build coat is what bridges movement in the layer below — and a floor made of interlocking planks is nothing but joints.

Microcement itself does not bend. It goes on thin and sets hard. Anything that shifts underneath has to go somewhere, and the mesh and build coat are what stop it going straight through your finish.

Problem one: the face is slick and non-porous

Laminate wear layers and vinyl faces are designed to shed everything. That is the point of them — you spill on them and wipe them clean. It is also the reason they are an awkward thing to bond to.

Primer needs something to grip. The label sequence is there for exactly this: sand or grind the surface, then vacuum, then prime, then broadcast kiln-dried sand into the wet primer while it is still wet. Those two mechanical steps carry most of the load on a slick substrate.

Sanding or grinding opens up the face so the primer has a scratch pattern to key into instead of sitting on a sealed sheet. Vacuuming matters just as much — you have just made a fine powder and it is sitting between your substrate and your primer, doing the same job as grease. Vacuum it. Do not sweep it around.

Then broadcast the sand. Primer is single part and ready to use, shake well, no mixing. Roll one even coat, uniform, no puddles or heavy spots, and while it is still wet throw the kiln-dried sand into it. That sets into a gritty mechanical key, so what goes on next is not relying on chemical adhesion to a wipe-clean surface. Coverage is 600–650 sq ft per pail and it cures in 30 minutes to 4 hours.

Skip the sanding or skip the sand broadcast on a laminate floor and you have built the whole job on a bond that was never really there.

Problem two: floating floors move as a sheet

This is the bigger one, and it is the reason the answer is not simply yes.

Most laminate and a lot of modern vinyl plank is a floating floor. The planks click into each other and rest on the subfloor. Nothing is fixed down. The whole surface is designed to slide slightly as a sheet, and it usually sits on a soft underlay that lets it do so.

A hard, continuous microcement finish laid on a surface that is designed to move is a bad pairing. The mesh and build coat handle the small movement of a solid substrate. They are not there to hold a floating floor still.

So find out what you have. Go to an edge or a doorway and look at how the floor meets the wall — a floating floor normally has a gap at the perimeter hidden under trim, and a glued or nailed floor does not. Press down across the middle of a room and at plank joints. Listen for clicking as you walk. If the floor shifts, clicks, taps or feels like it is riding on something soft, it is floating.

When the better answer is to lift it

We would rather say this plainly than sell you a kit for a job that will disappoint you.

What you have	Honest answer
Floating click-lock laminate or vinyl plank	Lift it. It is designed to move.
Glued-down sheet vinyl or vinyl tile, fully bonded, no lifting edges, no hollow spots	Reinforced over the top is reasonable.
Glued-down vinyl with lifting edges, bubbles or hollow-sounding patches	Lift it, or at minimum remove every loose area.
Laminate on a subfloor that flexes underfoot	Lift it and deal with the subfloor. No coating fixes bounce.
Vinyl over bare concrete, in good condition and firmly stuck	Either works — and lifting gets you to a Core-eligible substrate.

That last row is worth dwelling on. If there is bare concrete under your vinyl, lifting the vinyl changes which system you are allowed to use. A bare concrete floor is Core: primer, microcement, sealer, $1,778 for one of each, roughly $8 per square foot. Going over the vinyl instead keeps you on Reinforced at $2,676, roughly $14. That is $898 of difference in materials, and a day of scraping can be worth a lot more than $898 of your time.

The flip side is real too. Lifting an old glued floor is genuinely unpleasant work, and what is underneath may be worse than what you took off. If the existing floor is sound, flat and firmly stuck, going over it is a legitimate choice and it is what Reinforced is built for. The systems page sets out what each kit includes.

If you go over it, here is the sequence

• Wipe the surface clean — kitchen and hallway floors carry more film than they look like they do. Make sure it is dry and sound.
• Remove or refix anything loose, lifting or hollow. Those spots do not improve under a coating.
• Sand or grind the face, then vacuum.
• Primer, one even coat, sand broadcast while wet. Cure 30 minutes to 4 hours.
• Sand the primer, vacuum, fasten the mesh tight with staples or a glue gun, trowel the build coat into it. Two coats, sand broadcast while wet, 12-hour cure. Coverage 275 / 310 sq ft for first and second coat, 500 sq ft per mesh roll.
• Sand or grind, vacuum, then microcement. Coarse covers 375 / 450 sq ft, Smooth covers 600 / 725. Two coats, 12-hour cure.
• Sealer, two coats, 2-hour cure. Always required, every job.

On a floor, Coarse is usually the sensible base — it is the texture coat, large grain, natural stone look, and it can be heavily sanded until it is smooth to the touch or left lightly sanded to aid non-slip properties. Smooth suits walls, bathrooms and low-traffic floors.

Reinforced is seven coats with two 12-hour cures in it, so it is realistically a 2–3 day job. Each coat cures in hours, not days, but they stack. Work out quantities with the material calculator before you order — small rooms cost far more per foot because you cannot buy half a pail — and what microcement costs per square foot has the full numbers.

One thing that is not normal about any of this: you can buy it without a certification, a trade account or any proof you work in the trade. Almost all microcement in the US is sold only to certified applicators, which is why straight answers about awkward substrates are hard to find.

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