My marble sealer is not working! What is actually happening?

The most common call a stone care professional receives goes something like this. I had my marble sealed. I was careful. And now there are etch marks and stains everywhere. The sealer is not working.

The sealer is working exactly as designed. The problem is what most people are told sealing will do versus what it actually does.

Sealer vs DURAFLEX film at a glance

What sealing was designed for

A penetrating stone sealer is a liquid that fills the microscopic pores of the stone, reducing the rate at which liquids absorb into it. It gives you more time to wipe up a spill before it penetrates. On porous stones like travertine or limestone, it can meaningfully reduce deep staining from oils and coloured liquids.

It was not designed to prevent etching. It was not designed to create a chemical barrier between the stone surface and acids. It sits inside the stone, not on top of it.

Why etching still happens on sealed marble

Etching is a surface reaction. When lemon juice, wine, coffee, vinegar, or most soft drinks contact polished marble, the acid reacts immediately with the calcium carbonate on the surface. This happens before any liquid penetrates. It happens before the sealer has any opportunity to do anything.

The dull, frosted patch that results is not a stain that the sealer failed to prevent. It is a chemical change to the surface of the stone itself. Sealing cannot prevent it because sealing does not protect the surface. It protects what is below the surface.

For homeowners in Brighton, Hawthorn, Kew, Camberwell and Canterbury who invested in marble benchtops and were told sealing would protect them, this is a difficult thing to hear. But it is the reality the stone industry has understood for decades.

How often you reseal does not change this

Resealing every six months instead of every two years does not prevent etching. Applying multiple coats does not prevent etching. Using a premium professional-grade sealer instead of a consumer product does not prevent etching. The mechanism that causes etching operates at the surface, and sealing addresses what happens below the surface.

If your marble is etching despite regular sealing, the sealer is not the problem. The sealer is doing its job. The job it was given is simply not the job that needs doing.

What actually prevents etching

A physical barrier between the stone surface and the acids that cause etching. That is the only thing that prevents etching on marble.

DURAFLEX SPF™ is a polyurethane film applied over the stone. It creates that barrier. Acids contact the film, which is chemically inert to food, drink, and standard cleaning compounds. The calcium carbonate of the marble is never exposed. The etching reaction cannot occur.

Many Melbourne homeowners who have sealed marble apply DURAFLEX SPF™ on top. The sealer remains in the stone providing its stain resistance. The film adds the surface protection layer the sealer was never designed to provide. Together they address the full range of risks a marble benchtop faces in daily use.

If you already have etch marks

Existing etch marks need professional stone restoration before film can be applied. A stone specialist will hone or repolish the surface back to its original finish. Once the marble is restored, DURAFLEX SPF™ protects it permanently against future etching.

The investment in restoration plus film is considerably less than replacement. And Marble Anxiety™ ends the day the film goes on. For homeowners across Melbourne, DURAFLEX Accredited installers can assess the stone, advise on preparation, and provide an Estimate for the full process.

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