The painting of exposed aggregate concrete does not always work

Painting exposed aggregate concrete slabs is more like filling the cavities than applying a layer of paint. While facade paints can last up to a year for wall surfaces, abrasion-resistant products must be used for floor panels. Liquid plastics and gelcoat can be solutions.

Conventional paint doesn't hold up

In many places exposed aggregate concrete panels no longer correspond to the common ideal of beauty for a wall or floor covering. However, since the slabs are still mechanically flawless in many cases, many people think of beautifying the exposed aggregate concrete slabs by painting them. However, the characteristic surface structure of the exposed aggregate concrete does not allow conventional paint application.

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In order to permanently color an exposed aggregate concrete slab, a kind of sealing of the entire surface must be carried out, which can extend to filling the unevenness and creating a smooth surface. If possible, turning the exposed aggregate concrete slabs over can be considered as an alternative. The undersides can be painted with the usual concrete paints.

Synthetic resins and gelcoat

Castable epoxy resins are suitable for painting exposed aggregate concrete slabs. They are available in different colors that you can mix yourself. Synthetic resins with fillers such as small sand-like stones and other liquid plastics, often sold under the name concrete finish, can also be considered. Garage floor coatings such as gelcoat can also be tried out.

In any case, the painting of exposed aggregate concrete slabs is preceded by a test phase. After thorough cleaning with a high-pressure cleaner and complete drying, depending on the later color or the plastic or resin, an adhesive primer (€ 36.80 at Amazon *) must be applied. Following the manufacturer's instructions, epoxy resin or other paints should then be applied or poured on.

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In most cases a painter's brush is the most suitable tool to apply the "paint ". Here, a full application should be made in several work steps, which forms a layer several millimeters thick on the exposed aggregate concrete slabs. Each coat of paint is to be understood as a test, as the individual durability depends on many factors.

Test phase and plaster substrate

Anyone who wants to paint their exposed aggregate concrete slabs must always expect a failure, which only becomes apparent after months. If possible, only individual panels should be painted with the selected substance and exposed to the average loads that the total area will be subjected to.

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A good method is placing individual plates, for example, on a walkway or a terrace. The painted washing concrete should then be committed as the remaining plates. Who wants to avoid the "Stolipelfalle " and with the beautifying patience, can delete individual washing concrete plates in the middle of the total area with different methods and apply the most consistent and most severe solution to all plates in the following year.

An alternative is the plaster of the washing concrete before the delegate. Thus, a uniform surface is created, which can then be painted like conventional smooth concrete floors.

Tips & Tricks A short-term beautification can be reached with spray coatings. They are not very abrasion-resistant, but can be continuously sprayed if they always have multiple paint boxes in stock.