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Preparing A Concrete Floor For Painting

The building was complete and the floor was painted. The owner of the building walks in later in the day and sees a well painted floor with bumps. Bumps – the concrete was not evenly spread out. The owner anticipating a well prepared, aesthetically pleasing floor needed the bumps gone. The work men brought in a grinding machine to refine the surface.


Now if you’ve used a grinder you will know that they produce dust. So the work men proceeded to grind down the bumps on the floor. While trying to solve that problem the other perfect areas were collecting dust. At the end of the exercise, the entire area had to be hosed down and repainted. What does this mean? Extra material and labour were used which could have been avoided.


Painting can bring new life to the floor surface. With the right preparations it can be done using allotted money and time.


A good way to prepare for painting a floor is to do appropriate repairs in advance. This includes ensuring the area is flat and smooth enough to give the desired look e.g. fill up holes, grind down bumps and repair cracks or other imperfections. You can also attend to areas on the wall that need some work, maybe there are holes to fill.

Carefully clean the surface before you begin to paint. Paint has a tendency to collect particles in its path such as dust and dirt. These particles can be very apparent under the painted surface. What could also happen is, the paint will stick to the debris instead of the floor and will soon after peel off. If you are repainting the floor, you can remove the existing paint by chisel scraping, scarifying, scabbling etc. For new concrete floors, remove any curing agent residues or laitance (the weak layer of cement and aggregate fines on the concrete surface).


In addition to dust and dirt particles the floor should be free from other substances like water and oil. A degreasing agent can be used to remove oil and other substances.


Generally, the right preparation brings the best results, and that applies to painting a floor.