• Mechanical Polish

What is a Mechanical Polish and How Does it Differ from Grind and Seal?

Mechanical Polishing

A mechanically polished concrete floor is an extremely durable and luxurious finish. 

Unlike other concrete finishes, mechanical polishing is a complex, multi-step process that involves grinding down the concrete and polishing it to achieve the desired look, whether it be a matt, satin, or full gloss finish. This process does not involve applying a topical coating over the surface. Instead, heavy-duty concrete polishers use different grits during polishing to make the concrete itself shine.

The Polishing Process

Concrete is not considered polished before achieving a 400-grit finish. Typically, it is finished to either 800, 1500, or 3000 grit. The polishing process involves between 15 and 17+ separate steps, ensuring a high-quality, long-lasting finish.

Grind and Seal

In contrast, a grind and seal finish involves grinding the concrete to a certain level and then applying a topical coating over the surface. This coating can be made of various materials, such as epoxy, polyurethane, or acrylic, and provides a protective layer that sits on top of the concrete.

A grind and seal is quite a basic finish, and due to the thousands of micropores that appear after the grinding process, the topical sealer will find its way into these pores and, like grout, trap dirt, which is very difficult to clean. We generally don’t recommend a grind and seal for residential homes for this reason.

  • Mechanical Polish
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Key Differences

  • Durability: Mechanical polishing creates a more durable surface as it is the concrete itself that is polished and strengthened.
  • Finish: Mechanical polishing achieves a natural shine from the concrete, whereas grind and seal relies on a topical coating to provide sheen.
  • Maintenance: Mechanically polished floors generally require less maintenance as there is no topical layer that can wear down over time. In contrast, a grind and seal, due to the basic nature of the process, can get dirty easily and be difficult to clean.
  • Steps Involved: Mechanical polishing is a more intensive process involving multiple steps and different grit levels to achieve the desired finish.

Making the Right Choice

If you are considering a polished concrete floor or other concrete flooring finishes, it is crucial to do your homework. Speak with your builder to ensure that they, firstly, know the difference between a mechanical polish and a grind and seal, and secondly, can help guide you through the process of selecting and achieving a true, quality mechanically polished floor. The pour, process, and price per square meter can vary significantly.

Part of the process in specifying a mechanical polish should involve visiting a concrete supplier, ie Vic Mix, and select the concrete color, stone color, and level of exposure that meet your needs. For a full gloss finish, your slab should be poured to a 32Mpa strength by a concreter/builder experienced in installing a mechanically polished slab.

Choosing a mechanical polish requires early planning. Discuss this option with your architect, builder, and our team at Urban Floors before pouring your slab.

Comprehensive Concrete Solutions

At Urban Floors, we offer a full spectrum of concrete floor finishes. Our specialists are available to discuss the benefits of each option and help you make an informed decision for your project.

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