The Sealing Library · Perth
The three ways to seal a surface, compared.
For decades there were only two ways to seal a surface: lay a film on top, or soak a sealer down into the pores. In Perth's sun and cleaning, both wear out, so you reseal again and again. This is the honest head-to-head, film against impregnator against the new class that bonds at the surface, and where each one actually stands.
The old way, one
A film on top.
The first way is a coating that sits on the surface: an acrylic, epoxy or polyurethane film that caps the pores and gives that day-one gloss or wet look. It photographs beautifully. Then Perth gets to work on it.
What goes wrong
It blushes, peels and lifts
A film outdoors is loaded from both sides at once: UV, heat and abrasion from above, and a constant moisture and salt source from below, from capillary rise, rain, reticulation and pool splash. It blocks vapour, so the stone or concrete cannot dry. Salt then crystallises under the film and pushes the face off, the film blisters and peels, hot tyres pick it up, and epoxy and aromatic polyurethane go yellow.
Why it costs more each time
A failed film has to be stripped
This is the part nobody mentions at the quote. When a film fails, you cannot just recoat over it. It has to be ground and stripped back to bare surface first, which risks scratching the material underneath, before a new coat can go on. So every round of a film seal costs more than the last, and the failing film can pull the surface face off with it as it goes.
The old way, two
A sealer in the pores.
The second way is better: a penetrating sealer, an impregnator, that soaks 1 to 10 millimetres into the pores, lines the pore walls and repels water from inside. No film to peel. This is the sealer most Perth contractors reach for. It has one built-in flaw, and it is a big one.
Its protection is in the wrong place
A surface in service is scrubbed, pressure-washed, walked on, splashed with alkaline cleaner, baked under UV and fouled with oil, and every one of those loads acts at the surface, in the top sub-millimetre. An impregnator builds its repellency well below that, down the pore. So the wear zone meets effectively bare pore-mouth stone, and the thin top layer of repellency you actually feel is stripped first and fastest.
It fails from inside, and quietly
WA sun cleaves the water-repelling tail of the chemistry, alkaline cleaners and pressure washing strip the top, and the reservoir buried in the pore cannot wick back up to renew the face. The beading you can see can fade long before the sealer has left the stone. There is no visible end-of-life cue, so it fails silently, then all at once, often within a year or two in Perth conditions.
And many of them repel water only
Standard silane and siloxane repels water, not oil. On a benchtop, alfresco, pool surround or driveway, that leaves the surface open to the very thing that stains it: barbecue and engine oil, sunscreen and body oil. The enhancer grades that deepen the colour also change the look you paid for, the opposite of leaving the stone as it is.
The new class
Bonded at the surface.
There is now a third way, and it is a genuine category of one: the one and only next-generation sol-gel surface protective coating in Australia, nothing else works like this. A water-based mineral sol-gel bonds and cures at the surface itself, roughly 90 to 100 nanometres thin, colourless and breathable. It puts the protection exactly where the two old ways cannot: at the face, where the surface is actually used.
It bonds in, it does not sit on
On siliceous stone, concrete and cement-bound surfaces the sol-gel forms a genuine mineral bond as it cures. On porous carbonate like limestone and travertine it anchors into the mineral and pore structure by pore interlock and by grafting to the siliceous and cement fraction. Either way there is no film sitting on top to peel, chalk or yellow, and it stays breathable, so it will not trap moisture and flake the surface the way a film does. Read the full mechanism in how sealing works and the stone detail in stone and sealer chemistry.
It protects where the use happens
The dense mineral network sits at the face, so it meets the mechanical, chemical, UV and oil loads of real cleaning together, at the surface, rather than stranding its protection down a pore where none of it reaches. That is the whole wedge, and we set it out in full in surface resistance to real use.
It renews with a top-up, not a strip
Because it degrades by slow nano-scale abrasion with no cliff-edge, when it is eventually due it reapplies over clean surface. There is no failed film to grind back, so a renewal is a top-up, not the strip-and-start-again cycle a film puts you on. More on that in sealing and maintenance.
Side by side
The three ways, on one axis.
The same honest triad decides every row: where the protection sits, whether the surface can still breathe, and how you renew it. Lifespans are WA-realistic field guidance, not temperate-lab figures.
| A film on top | A sealer in the pores | Bonded at the surface | |
|---|---|---|---|
| Where it protects | On top of the surface | Deep in the pores | At the surface, where wear happens |
| Breathable | No, it caps the pores | Yes | Yes |
| Look | Gloss or wet look, then blush | Minimal, enhancer grades darken | Colourless, changes nothing you see |
| Cleaning and pressure washing | Scratches, chalks and peels | Strips the thin top layer first | Built to survive the cleaning |
| Oil and grease | Moderate until it wears | Weak, repels water only | Sits on top, lifts in cleaning |
| When it is due in WA | Often inside a year on flat, trafficked areas | Surface beading often within a year or two | Years, then a top-up |
| How you renew | Full strip back to bare surface | Reapply, clean first | Top-up, no strip |
| Failure mode | Damages the surface as it fails | Silent, then sudden | Gradual, no substrate damage |
The one place we do not top the table is raw oil repellency, where the old fluoropolymer, PFAS chemistry was stronger. That chemistry is now being regulated out: Australia has already banned PFOA, PFOS and PFHxS. Our coating is PFAS-free by design, not by reformulation, because the inorganic mechanism never needed fluorine to perform.
Know before you sign
How to tell what you already have.
Before you pay for another seal, work out what is on the surface now. It tells you whether you are on the strip-and-redo cycle or not.
- Peeling, flaking or a milky blush? That is a film. It will have to be stripped before anything new bonds properly.
- Looks untouched but no longer beads? That is a spent pore sealer. The repellency has gone from the surface even if chemistry lingers in the pore.
- A sheen or wet look you can feel as a coating? A film again, or an enhancer grade that has darkened the stone.
- Raw, drinks in water, darkens when wet? Unsealed, and thirsty, so it stains fast until it is protected.
What a good quote should specify
Ask for the class, not just the word
- Which of the three it is: a film, a pore impregnator, or a bonded surface coating.
- Colourless and breathable, in writing, so it will not darken the surface or trap moisture.
- The preparation: a full clean to a sound, open surface, and for new concrete the cure time before sealing.
- How it renews: by top-up on clean surface, or by a full strip.
- A written, registered guarantee and its term, not a verbal promise.
Ours is straightforward: $16/m² all-in, $950 minimum, colourless, breathable, renewed by top-up, and registered under a 10-year guarantee. See the plain-English boundaries on the guarantee
See it on your surface
The three ways, on real surfaces.
The theory lands differently once it is your driveway, your pavers or your brick. Here is where each old way tends to fail, and how the bonded coating handles it.
Concrete
Exposed aggregate
The classic case: sealed at the payment gate with a cheap acrylic film that whitens and hot-tyre-lifts within a year. The bonded coating skips the film entirely.
Read the guideNatural stone
Travertine
Porous carbonate around pools, where a film blushes and spalls and a pore sealer fades. It anchors into the mineral and pore structure and stays breathable.
Read the guideBrick & masonry
Clay brick
Face brick and masonry where a vapour-blocking film is exactly the wrong answer and drives efflorescence. Breathable protection is the honest fit here.
Read the guideHow sealing works
The mechanism from the ground up: what a sealer is doing, and why bonding at the surface changes the outcome.
Read the pillarSurface resistance to real use
The four loads a surface really takes, cleaning, chemicals, UV and oil, and why an impregnator cannot meet them.
Read the pillarGlass protection explained
The glass side of the story: how a clear nano coating keeps shower and balustrade glass clearer for longer.
Read the pillarNot sure which surface is yours, or what it is worth sealing? Browse the whole Sealing Library
Straight answers
The questions people actually ask.
How do I tell what sealer I already have?
Look and touch. A film sits on top with a sheen or a wet look, you can often feel a coating, and it tends to peel, flake or whiten at the edges. A pore sealer changes little you can see, beads at first, then quietly stops beading within a year or two. A surface that was left raw simply darkens and drinks in water. If it is peeling, it is a film. If it looks untouched but no longer beads, it is a spent pore sealer.
Is a penetrating sealer the same as what you do?
No. A penetrating sealer, an impregnator, builds its protection down in the pore, 1 to 10 millimetres below the surface, which is the wrong place for how a surface is actually cleaned and used. Our coating is a mineral sol-gel that bonds and cures at the surface itself, in the top sub-millimetre, where wear, cleaning and staining happen, and it renews with a top-up rather than a strip.
My driveway was sealed and now it is peeling and patchy. What went wrong?
That is a film failing. A topical acrylic or coating film caps the pores and blocks vapour, so moisture and salt cannot escape and collect under the film, which then blushes milky, blisters and peels, and hot tyres lift it. A failed film cannot be recoated. It has to be stripped back to bare surface first, which is what makes each round cost more than the last.
Why does a cheap seal need redoing every year or two in Perth?
Because WA is the hard case. Strong UV, alkaline cleaners, pressure washing, pool chemistry and reticulation all attack a sealer at the surface. A pore sealer builds its repellency below that wear zone, so the thin top layer you actually feel is stripped first and fastest, and the reservoir buried in the pore cannot wick back up to renew the face. The beading you can see fades well before the sealer has fully left the stone.
What should a good sealing quote actually specify?
The class of sealer, not just the word sealed. It should say whether it is a film, a pore impregnator or a bonded surface coating, that it is colourless and breathable, how the surface will be prepared, and how it is renewed when due, by top-up or by strip. It should also name a written, registered guarantee and its term. Our sealing is $16/m² all-in with a $950 minimum, registered under a 10-year guarantee.
Do you have to strip the old sealer off first?
It depends what is on there. A failed film has to be stripped back to a sound, open surface before anything new will bond, and we will tell you that up front. A spent pore sealer or a raw surface usually just needs a proper clean. Once our coating is on, renewing it is a top-up on clean surface, with no film to grind off.
Get a quote
Skip the redo cycle. Seal it once.
We will tell you what is on your surface now, prepare it properly, and seal it with the bonded coating that is right for the material, registered under a 10-year guarantee. Confirmed price before you book.