Concrete is tough, so a lot of people assume it can be left to fend for itself. In Central Queensland, that’s a mistake. Between the relentless UV, the humidity, the wet-season deluge and the coastal salt air around Yeppoon and Emu Park, unsealed concrete stains, fades and grows mould far faster here than in cooler parts of the country.
So — does concrete need to be sealed? For outdoor and decorative concrete in our climate, the honest answer is yes, if you want it to look good and last. Here’s what sealing does, which surfaces need it most, and how often to reseal in Rockhampton.
What sealing actually does
A concrete sealer is a protective barrier that sits on (or penetrates into) the surface. A good one:
- Blocks moisture getting into the concrete — which is what feeds mould, algae and lichen in our humidity.
- Shields colour and finish from UV, so coloured and decorative concrete doesn’t wash out in the CQ sun.
- Repels stains — oil, tyre marks, leaf tannins, food and drink spills — so they wipe off instead of soaking in.
- Makes cleaning far easier, because dirt sits on the surface rather than in it.
Unsealed concrete is porous. Everything the weather throws at it soaks in — and once it’s in, it’s much harder to get out.
Which surfaces need sealing most
Not every slab is equal. In order of how much they benefit from sealing:
- Exposed aggregate, coloured and decorative concrete — the decorative layer is exactly what UV and weather attack first. Sealing is essential to protect the look you paid for.
- Driveways — high traffic, oil drips, tyre wear and full sun. Sealing keeps them cleaner and slows surface wear.
- Patios, alfresco areas and pool surrounds — food, drink, sunscreen and constant damp. Sealing makes them far easier to keep clean.
- Paths and general slabs — benefit from sealing but are lower priority than the above.
Interior slabs and polished concrete floors are usually sealed or treated as part of the finish, so they’re covered from day one.
How often should you reseal in CQ?
As a general guide for Central Queensland:
| Surface | Reseal roughly every |
|---|---|
| High-traffic driveway in full sun | 2–3 years |
| Decorative / coloured / exposed aggregate | 2–4 years |
| Sheltered patios and paths | 3–5 years |
That’s more frequent than the cooler southern states, because our UV and humidity are harder on sealer. Surfaces in full sun and heavy use are at the shorter end; shaded, low-traffic areas at the longer end.
The simple test to know when it’s time
You don’t need to guess. Splash some water on the concrete.
- If the water beads up and sits on top, the sealer is still working — leave it.
- If the water soaks straight in and darkens the concrete, the sealer has worn through and it’s time to reseal.
Do this test on a driveway once a year, especially in the tyre tracks and near the entry where wear is heaviest.
Can you seal old concrete?
Yes. Even bare, weathered concrete can be cleaned up and sealed — it’s one of the cheapest ways to freshen up a tired driveway or patio without resurfacing or replacing it. The surface needs to be properly cleaned and any mould treated first, then the right sealer chosen for the finish. Done well, it can make old concrete look years younger.
The bottom line
In Rockhampton’s climate, sealing isn’t optional maintenance — it’s what keeps concrete looking good and lasting its full 30–40 years. Seal it, retest each year, and reseal when the water stops beading. Decorative surfaces especially will thank you for it.
Not sure whether your concrete is due? Our concrete sealing in Rockhampton page covers sealer types and timing, or get a free quote and we’ll take a look and give you honest advice.