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Frequently Asked Questions

From "Can overlay treatments be put over timber floors?" to "Are there different types or levels of acid washing?", we have all the answers to Frequently Asked Questions.

Top Class Concrete Treatments

Are there different types or levels of acid washing?

Yes, there are 3 different levels of acid washing. A light acid wash is just enough to lightly clean the surface and open the concrete enough to apply Sealer. A medium acid wash is just enough to expose some of the fine sands in the concrete. A hard acid wash or acid etch creates full exposure of the sand content in the concrete. This hard wash is good for non-slip purposes or for a “burnt” look to coloured decorative concrete.

Will my grout crack?

Concrete always moves (expands and contracts) so yes it will crack in the grouted expansion cuts. However, it is usually a crack straight along one edge of the grout line. On rare occasions it may chip or crack on both sides and fall out, if this happens, we will be happy to repair this for you.

Why does concrete crack?

As concrete is continually moving, expansion cuts are placed in the concrete to help determine where we would like the cracking to happen to allow free movement of the substrate. Unfortunately, sometimes the concrete moves in other ways and therefore cracks may appear in random areas where expansion cuts have not been placed.

Can I choose the grout colour?

A large percentage of the grouting work that we undertake is done using standard grey grout. If you would like your grout to be darker, we will happily do this for you. We do not recommend attempting to match the colour of your grout with the colour of your concrete.

Can I have any pattern I like?

In most cases yes, however, if there are expansion cuts in your concrete it is a good idea to work them into the pattern to disguise them.

Can overlay treatments be put over timber floors?

Yes, it can be. We lay down cement based slate and tile board first so that the overlay can be laid on top of it.

Can I choose the level of gloss?

Yes, you can. Sealer comes in low sheen, semi-gloss and high gloss.

At what stage of the building process does the concrete sealing start?

It is recommended that the sealing takes place toward the end of the build as much as possible so that no damage is done to the finished product. It is preferred that the kitchen be placed once the sealing process has finished – without scratching the floor.

How long does the sealing process take and when can I walk on the sealed area?

On ground concrete we use 3 coats of sealer and each coat is done 24 hours apart. On a coloured concrete floor we use 2 coats of sealer and each coat is done 24 hours apart. There is to be no foot traffic for 5 days and full strength for 28 days (heavy furniture). However, if you would like to have a high gloss finish, a different sealer can be used that is 2 coats with 8 hours between each coat and foot traffic can begin just 12 hours after the final seal and with full strength after 48 hours.

Is sealed concrete slippery?

When wet, yes sealed concrete can be slippery, although it is no more slippery than tiles or vinyl.

How long after my concrete has been sealed, can I walk and drive on it?

You will be able to walk on the sealed area between 1- 3 hours after the final coat of sealer has been applied. Vehicles must be kept off the sealed area for 5 days.

Is sealed concrete slippery?

When wet, yes sealed concrete can be slippery, however, we seal concrete with a clear silicone sand that ensures a non-slip finish.

Why is my sealed concrete look like it has measles after it rains?

Occasionally following sealing, some concrete surfaces may get dark patches when wet, that disappear upon drying. This is called measling and is caused by microscopic holes/cracks/high-points in the sealer that allow small amounts of water into the concrete. It only happens from time to time and is the result of concrete being concrete, not bad workmanship or faulty materials

Over time the effect will become less and less. To fix, we suggest topically applying more coats of sealer - sometimes many coats - but be careful not to add too many over large areas as it may increase slipperiness.

When should my concrete be re-sealed?

To keep your concrete looking at its best it should be re-sealed every 2-3 years. We provide this service and will send you a reminder letter when your concrete is due to be re-sealed.

Why is my coloured concrete inconsistent (patchy)?

Patchiness is most likely the drying of concrete. However, concrete is a natural product and will always have different variations of your chosen colour. If you are looking for a consistent colour to your concrete, there are concrete paints available that will give you the desired finish.

My concrete has dried very uneven

Very occasionally a phenomenon called Pinto occurs in concrete, regardless of whether colour is used or not. It’s not known the exact mechanism, but it seems to be related to the curing of the concrete ie how it dries and how moisture moves through the slab.

Ensuring consistency of placing and curing across the slab should help to prevent it. It’s very easy to fix, we can apply one of our resurfacing products to it and give you a new consistent coloured surface.

It's very easy to fix, we can apply one of our resurfacing products to it and give you a new consistent coloured surface.

Top Class Concrete Treatments

Top Class Concrete Treatments are specialists in Acid washing / etching, Concrete Cutting, Decorative Grinding and Grouting. 

Top Class Product Treatments

At Top Class Concrete Treatments we believe any concrete can be totally rejuvenated with the right concrete overlay products.

Top Class Maintenance

Top Class Concrete Treatments can take care of all your concrete repair, maintenance and restoration needs that you require.

Planning a project or want to discuss different concrete treatment options?