Coloured concrete · technical reference
The chemistry of sealing coloured concrete.
The specifier's version. MineralProtect is the one and only next-generation sol-gel surface coating in Australia, and coloured concrete is a textbook fit for it: a cement-bound surface whose own chemistry lets an inorganic silica network bond straight into it. Here is exactly how the bond forms, what the coating resists, how it treats efflorescence and the pigment, and where its limits sit, honestly bounded.
At a glance
The coating, on coloured concrete.
Water-based inorganic sol-gel surface coating.
A cross-linked silica network engineered at the surface, not in the pores.
In the order of 90 to 100 nm dry. Conformal, follows the concrete's profile.
Grafts to the silanols on the cement paste and quartz aggregate.
Non-pigmenting. Changes surface energy, not colour, oxide or finish.
Does not cap the pores. The slab keeps releasing moisture.
The mechanism never relied on fluorine to perform.
On the repellency function. Sits on top of your ACL rights.
The bond
The bond is the shared story. The colour is the delta.
Concrete is a siliceous surface: Portland cement paste rich in calcium silicate hydrate, packed with quartz sand and aggregate, all carrying reactive surface silanols. Our sol's silanols condense with them into genuine covalent Si-O-Si bonds, and the coating keys into the surface texture as well. That covalent bonding mechanism is the same one we use on every mineral surface, so we cover it in full in the pillar. What is specific to a coloured slab is narrower and it matters more: what the coating does to the pigment, and how it treats the efflorescence that shows so starkly on colour.
Colourless, so the oxide stays exactly as poured
The coating carries no pigment and forms no film over the colour. It is applied thin and conformal, wetting into the surface topography and curing to the contour rather than pooling into a membrane, so it raises stain and cleaning resistance without changing the oxide you specified, the finish, or adding a wet-look sheen. Whether the colour is integral to the mix or a dry-shake hardener broadcast on the surface, both are cement-bound and both take the coating the same way.
Breathable, so efflorescence completes on top
Efflorescence is calcium hydroxide dissolved and wicked out of the slab, then carbonated at the surface to calcium carbonate. It is a moisture-transport phenomenon, driven from within the concrete, so no surface coating stops it being produced. Because ours does not cap the pores, that bloom completes at the surface where cleaning lifts it, rather than being trapped beneath a film to cloud, bubble and blush the coating from below. On a coloured slab, where the haze shows far more than on grey, that difference is the whole game.
One thing it does not do: it is a thin surface coating, not a deep consolidant. It does not penetrate millimetres, form new calcium silicate hydrate or strengthen the slab. Its job is the surface, and that is a virtue, because the surface is where the wear is.
The wedge
Four resistances, and the one place they all land.
A driveway or patio in service meets mechanical, chemical, UV and oil loads together, at the face. Our architecture puts the protection there; a penetrating impregnator strands its repellency millimetres down the pore, below the wear zone. Those four resistances, and the honest bound on each, are the same story on any surface we seal, so we work through them in full in the pillar.
Read the four real-world resistances in full
What is specific to a coloured slab
UV and oil are the two that decide it on colour
The inorganic backbone carries no organic chain to photo-oxidise, so it does not yellow or chalk the way an acrylic colour seal or a urethane film does baking on a coloured slab. That matters twice on colour: a yellowing film muddies the oxide, and ours adds no film to yellow. Far more UV resistant than an organic film, not UV proof. Oil is the other one: car-oil drips and barbecue splash sit on the surface and lift in cleaning instead of setting into the pigmented paste. Oil is an outcome here, never a number. We reach it PFAS-free by design, not by reformulation, and we do not claim to match the raw oil repellency of the fluoropolymer chemistry that is now being regulated out.
Us versus the legacy classes
The film-versus-pore-versus-bonded call, and the two traps unique to colour.
The full head-to-head across every category, film on top, sealer in the pore, and our bonded surface, with the honest triad of architecture, location and renewal, lives in the pillar. We discuss categories, never brands.
Read the full sealer types compared
The cure-and-seal film, on a coloured slab
The decorative-trade day-one default, sprayed on at finishing for a wet-look sheen. An organic film caps the pores and blocks vapour, so the slab cannot dry. Outdoors it blushes milky, chalks and lifts on the wheel tracks, while the trapped efflorescence clouds it from underneath, and a yellowing film muddies the oxide. On grey it is a nuisance; on colour it is the whole surface you paid for going off. A failed film cannot be recoated, it must be stripped. Ours bonds in, stays breathable and colourless, and renews with a top up.
The solvent colour or enhancer seal
Formulated to deepen and gloss the colour for a wet look. That is a legitimate aesthetic choice, but it is a film with the film's tradeoffs: it darkens the surface, it can go patchy as it wears, and it fails the same way outdoors. Ours is a different category. It is colourless and changes nothing you can see, so it suits an owner who wants the concrete to stay exactly the colour it was poured, not one chasing a high-gloss finish.
How durability is measured
Proven the way a coating should be.
Surface durability is contact-angle retention across recognised wet-scrub and abrasion cycles, not a marketing multiple. These are the standards a specifier should ask any concrete sealer to be tested against.
- Wet-scrub and abrasion. ISO 11998 and ASTM D2486 for scrub, ASTM D4060 Taber for abrasion: contact-angle retention across cycles is the honest measure of whether a coating survives cleaning and traffic.
- Preparation is half of it. Any coating fails if it bonds to laitance, curing residue or a failing film. Full curing and correct surface prep to a sound, open surface decide longevity as much as the chemistry.
- Independently tested. The JUMBOGUARD stack is tested at independent houses including TUV Rheinland, SGS, Intertek and under REACH.
A note on numbers
We cite the family, not a figure we don't hold
Our sister coating GlassProtect is still beading above 100 degrees after 3,000 cream-cleanser cycles, wearing around three times slower in comparable testing. That is glass. We do not publish an invented scrub or hardness number for MineralProtect on concrete; we cite the standards above and the family evidence, and let the mechanism carry the rest.
The limits, stated plainly
What it cannot do.
- Not permanent, not maintenance-free, not stain proof. A long-lasting treatment that degrades predictably and needs periodic reapplication. It makes cleaning faster and far less frequent; it does not remove it.
- It does not stop efflorescence at the source. The bloom is moisture-driven from within the slab, so no surface coating prevents it forming. The advantage is breathability: unlike a film, it does not trap the bloom underneath. It completes on top, where cleaning lifts it, and a new slab can still bloom while it cures out.
- It is not a wet-look or colour seal. It is colourless and non-pigmenting by design, so it will not deepen, gloss or restore the colour. That is the point for an owner who wants the oxide left as poured, and the wrong product for one who wants high gloss.
- Chemical stability is bounded. The network is more resistant to alkaline cleaning, not alkali proof; silica hydrolyses above about pH 8. Stable at routine cleaning pH and short contact only.
- Oil is an outcome, never a number. It sits on the surface and lifts in cleaning. It does not match fluoropolymer oil repellency, and no non-fluorinated coating durably does.
- Beading fades before protection. Loss of beading is a prompt to re-test, tied to the guarantee, not proof of failure. And it is a guarantee, backed by certified application and per-job registration, never a warranty against every kind of damage.
Technical questions
For the specifier.
Is the bond to coloured concrete genuinely covalent?
Yes, on cure. The cement paste's calcium silicate hydrate and the quartz aggregate carry surface silanols, and the sol's silanols condense with them to Si-O-Si, continuous with the concrete. Initial contact is physisorption and hydrogen bonding; the covalent bond forms as the network cures, and it is in addition to the coating keying into the surface texture. Integral oxide and dry-shake colour hardener are both cement-bound, so both take the coating the same way.
Does the oxide colour or a dry-shake hardener affect how it bonds?
No. The pigment is inert oxide dispersed in the cement matrix or the hardener; it does not change the silanol chemistry the coating grafts to. What matters for the bond is a sound, clean, fully cured surface free of laitance, curing residue and any failing film. The coating is colourless and non-pigmenting, so it neither carries colour nor alters the colour already there.
How does it handle efflorescence differently to a cure-and-seal?
Efflorescence is calcium hydroxide dissolved and wicked out of the slab, then carbonated at the surface. It is moisture-transport from within, so no surface product stops it being produced. A cure-and-seal film blocks vapour and traps the bloom beneath it, where it clouds and bubbles the coating. Ours stays breathable and does not cap the pores, so the bloom completes at the surface and cleans off. On a coloured slab that shows the haze starkly, this is the decisive difference.
Does it consolidate or strengthen the slab?
No, and we will not claim it does. This is a thin surface coating, not a deep consolidant. It does not penetrate millimetres, form new calcium silicate hydrate or add structural strength. Its function is at the surface: repellency, easier cleaning and stain resistance, where the concrete is actually used.
Do you hold a slip rating for the coating?
No, and we make no slip claim. The coating is a thin conformal treatment that follows the concrete's profile and changes surface energy, not a film that lays over the texture, so unlike a topical film it does not add a layer over the profile a pendulum or ramp measures. Where a slip classification is part of a specification, the correct route is independent accredited testing to AS 4586 on a sample of the actual slab, coated and uncoated, which we support rather than self-certify.
Go deeper
The shared science lives in the pillars.
This page carries what is specific to a coloured slab. For the science it stands on, follow these.
Pillar · the mechanism
How sealing actually works
The third class of sealer: how a sol-gel bonds covalently at the surface instead of filming on top or hiding in the pore. Read the pillar
Pillar · the wedge
The four real-world resistances
Cleaning, chemical, UV and oil, each with its honest bound, and why protection at the surface beats protection stranded in the pore. Read the pillar
Pillar · the head-to-head
Sealer types compared
Film on top, sealer in the pore, bonded at the surface: the full comparison across every category, honestly. Read the pillar
The plain-English version
Sealing coloured concrete, in plain English
The homeowner's version: what goes wrong, how it protects, and the honest limits, without the chemistry. Read the overview
The library
The Sealing Library
Every common WA surface, honestly graded, with the plain-English guide and the science for each. Browse the library
Get a quote
Specify it with confidence.
We'll prepare and seal your coloured concrete with MineralProtect to a certified standard, registered under a 10-year guarantee. Documentation and safety data sheet on request.