When a surface needs to be stripped back fast — paint, rust, coatings or contamination — sandblasting (abrasive blasting) is the most effective way to get to clean, sound substrate. Goliath Coatings provides professional sandblasting across Auckland for steel, concrete, masonry and industrial structures, on site or in our yard.
What sandblasting removes and why it matters
Sandblasting fires graded abrasive at high pressure to cut through old paint, mill scale, rust and laitance, leaving a clean surface with the right profile for a new coating to grip. Most coating failures trace back to poor preparation — recoating over a contaminated or smooth surface — so blasting to the correct standard is what makes the next system actually last.
The right abrasive and profile
We match the abrasive media and pressure to the substrate and the job: aggressive enough to strip steel back to bright metal, controlled enough to clean masonry or concrete without destroying it. We assess the surface, the coating that has to go on afterwards and the surrounding environment, then set up containment so the work is clean and compliant.
On-site and in-yard blasting
We blast structural steel, tanks, balustrades, plant and concrete on site where the item cannot move, and take smaller fabrications in our yard for a controlled finish. Either way we follow straight into priming or coating while the surface is clean, because freshly blasted steel will start to flash-rust within hours if it is left.
What sandblasting achieves
Sandblasting is the most aggressive, fastest-cutting preparation we offer. Driving garnet or hard grit at high pressure, it strips coatings, rust, mill scale and laitance and profiles concrete and steel — including the vertical and overhead surfaces other methods can’t reach. On concrete it opens the surface to roughly an ICRI CSP 4–6 anchor profile so high-build coatings key in and stay bonded; on steel it cuts to a near-white finish. The trade-off is dust and spent media, so we contain and clean as we go.
Why choose Goliath Coatings
Abrasive blasting and surface preparation are a core specialty. We own our blasting gear and match the abrasive and profile to the substrate — steel, concrete or masonry — so whatever goes on next bonds properly and lasts. Free on-site assessment, one-business-day response, and 5-star Auckland reviews.
Sandblasting FAQs
Q: What can you sandblast?
A: Steel, concrete, masonry, balustrades, plant and structural items — we match the abrasive and pressure to the material and the finish required.
Q: Do you contain the mess?
A: Yes — we set up containment and clean-up appropriate to the site so blasting is controlled, safe and compliant.
Q: Can you coat straight after blasting?
A: Yes — we prime or coat promptly after blasting because clean steel begins to flash-rust within hours if left exposed.
Q: What surface does sandblasting leave for coating?
A: A clean, roughened anchor profile — around CSP 4–6 on concrete, near-white on steel — so the next coating bonds properly. It’s the most aggressive prep we run, ideal for heavy coatings and rusted steel.
Q: What determines the cost?
A: The surface area, the media required, and what is being removed — coatings, corrosion or contamination. We inspect the surface free of charge and quote a firm price for the finish standard you need.
Q: Is the work guaranteed?
A: Yes — our workmanship is guaranteed and we install proven systems from leading suppliers. Goliath Coatings is fully insured, Tōtika accredited and Site Safe certified.