Correctly paint gypsum plaster

Gypsum plaster is a popular wall covering that makes sense due to its properties. However, gypsum plaster is also somewhat problematic as it cannot be painted equally with all paint systems. If unsuitable color systems are used, this can have a drastic effect on the room climate. We have therefore put together valuable information on painting gypsum plaster below for you.

Gypsum plaster must not be painted with any color system

Gypsum plaster is a mineral and highly absorbent wall plaster. This means that gypsum plaster helps to regulate the room climate to a considerable extent. In many houses so much that gypsum plaster is deliberately used. However, do-it-yourselfers in particular tend to sort many color systems based on their prices rather than their properties. That is why emulsion paints are often used on gypsum plaster.

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However, they partially seal the plaster of paris - in unfavorable cases even completely. You will not notice any disadvantages immediately after painting gypsum plaster. However, mold growth can be promoted in the medium to long term. Because, for example, the popular emulsion paints close a surface like a seal, so that the moisture-regulating properties of gypsum plaster can no longer be used.

Suitable paints: emulsion silicate paints with a special deep primer

You cannot use pure silicate paints either. These silicify with the substrate, which is also necessary with gypsum plaster. However, water glass is responsible for the silicification of pure silicate paint, which in turn is not compatible with gypsum plaster. The silicate contained here is potassium silicate and also known as potassium silicate. Since there is an undesirable reaction between gypsum plaster and silicate paint, tensions arise, which in turn lead to cracks.

On the other hand there is the emulsion silicate paint (not to be confused with emulsion paint), which is based on inorganic binders. If a special deep primer (4.81 € at Amazon *) is applied, you can use dispersion silicate paints on gypsum plaster, because there are no differences to pure silicate paints in the important properties (apart from silicification). This means that dispersion silicate paints are also permeable to water vapor.

Alternative to dispersion silicate paint on gypsum plaster: lime paint

As an alternative to these modern colors, you can also use traditional colors such as lime paint (€ 14.49 on Amazon *) when painting gypsum plaster. Not only is it a "healthy" paint, lime paint made from slaked lime can also be painted over at any time. In addition, lime paints have a high luminosity that other paint systems cannot achieve. A disadvantage, however, is that lime paints darken. The preparation of gypsum plaster is also important. Because after the plastering of gypsum plaster, a thin sintered layer can form, which must first be removed. The removal of the sintered layer should be carried out mechanically because chemical fluating is not possible on gypsum plaster. Lime paint does not always stick well to gypsum plaster, which is why a primer makes sense in individual cases.

Tips & Tricks With gypsum plaster in particular, it can happen that the paint - even if it is a suitable color, as is the case with dispersion silicate paint - does not stick to the gypsum plaster. Then it may be that the gypsum plaster was not applied properly (wrong adhesion promoter before the gypsum plaster, etc.).

There are indeed many points to consider when painting gypsum plaster. If you are not sure in the use of actually suitable colors, you should definitely pull a specialist (for example, painter).

Concern with gypsum plugs that the necessary depth reason, as the name implies, deep into the gypsum plaster. The subsequently applied dispersion silicate paint then seals with the depth basis, so goes a chemical compound. Everything has the consequence that the color is not just on the plaster. Therefore, such a color can not be easily removed from gypsum plaster. Rather, then the top layer must be ground plastered. Especially in rental properties, you must clearly clarify the swipe of gypsum plaster with your landlord and obtain his written consent.

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