If you’ve been quoted on render and someone’s mentioned “acrylic” or “polymer” render — or you’ve seen the term on a product label and wondered what it actually means — this is the no-jargon explanation.
Traditional cement render (“sand & cement”)
The classic. A mix of sand, Portland cement and water (sometimes with hydrated lime added for workability) trowelled onto a brick or block wall and finished by hand. It’s the render you’ll see on most older Gold Coast homes.
Strengths: strong, hard-wearing, breathable, traditional look. Cheap as a material.
Weaknesses: rigid — doesn’t flex with the building, so hairline cracks are common. Long cure time (21–28 days) before painting. Needs the substrate to be solid masonry — not great on blueboard or polystyrene cladding.
Acrylic render
A factory-mixed render where the binder is a polymer (acrylic) instead of cement. Often comes pre-tinted in your chosen colour, so the colour is in the render itself — no painting required afterwards. Brands like Render Systems Australia and Rockcote dominate this category in Australia.
Strengths: flexible — resists hairline cracking as the building moves. Bonds to a much wider range of substrates (blueboard, foam, smooth surfaces). Quick to apply, top-coats within 24 hours, and the colour never needs repainting if pre-tinted.
Weaknesses: more expensive per square metre. Limited to the colours the manufacturer offers (although that’s usually plenty). Some look slightly “plastic” up close compared to a hand-floated cement finish.
Side-by-side
| Cement render | Acrylic render | |
|---|---|---|
| Cost (per m²) | $ — cheapest | $$ — mid |
| Cure time before paint | 21–28 days | 24 hours |
| Flexibility (cracks?) | Rigid | Flexible |
| Colour | Painted afterwards | Often pre-tinted, no paint |
| Brick & block | ★★★★★ | ★★★★ |
| Blueboard / cladding | ★ | ★★★★★ |
| Polystyrene fences | ★ | ★★★★★ |
| Heritage matching | ★★★★★ | ★★ |
How to pick
- Patching an existing cement-rendered wall? Match like with like — cement render. The new patch needs to behave the same as the existing surface.
- Re-rendering blueboard, polystyrene cladding or a moving wall? Acrylic, every time.
- Rendering a fence and don’t want to paint it? Coloured acrylic. Set and forget.
- Heritage / period home, looking for the right texture? Cement, finished by hand.
You don’t pick render in the abstract — you pick it for the wall it’s going on. The right answer is always “whatever matches the substrate, the existing finish and the budget”.
What we use at Render Repair
Both. We carry traditional bag/cement render for all our brick and block repair work, and Render Systems Australia and Rockcote acrylic for blueboard, fences and modern claddings. We’ll quote the right product for your wall — not just whatever’s on the truck that day.
Read more about the render and paint products we use, or browse our full list of services.
Call us on 0405 772 878 for a free quote on the Gold Coast.
About — Render Repair is the Gold Coast’s render & repaint specialist. 30+ years on the tools, QBCC #1192125. Honest quotes, fixed prices, finishes you can’t pick from the original wall.
