Instructions for the application of a trowel floor or a jointless wet cell with Stucco Extra

Step-by-step instructions Stucco Extra


1) Surface preparation:

When used on the floor:

In the case of a beautifully smoothed screed, the first layer can be applied right away; in the case of cracks or sanding substrates, pre-filling with flexible tile adhesive and reinforcement fabric is recommended. On a bonded waterproofing in the wet cell or similar, the tiles are also prefilled with tile adhesive and primed with a pigmented plaster primer.

When used on walls:

If lime plaster, cement plaster or gypsum cement plaster is present as a plaster base, the priming can be started immediately. However, if you do not have any mineral substrates, such as dispersion paints, plasterboard, glass, tiles, MDF and also reinforced concrete, etc., prime the surface with an adhesive primer. The adhesion primer with marble grains must dry out for at least 12 hours, the adhesion primer with vegetable casein can be reworked after approx. 4 hours. In general, a primer is recommended, as the absorbency is adjusted and thus facilitates application.

2) Coating build-up:

Stucco Extra is dyed with a coloured dough to the chosen shade. The instructions for preparing the coloured dough can be found further down in the text. The white or coloured putty is applied to the prepared substrate in grain strength and then dried for 12 hours. The material must be thoroughly stirred beforehand and, if necessary, up to 1% water can be added. Apply so much that the plaster primer is nicely covered. It is best to use a smoothing trowel with a rigid blade. The consumption for the first coat is approx. 1000 grams/m². Now the surface is scraped off with a trowel so that there are no more scratching grains or coarse trowel strokes. Clean the surface with a vacuum cleaner. This coating is repeated to achieve a hard-wearing and very smooth surface. After the second layer has dried with Stucco Extra, Stucco Veneziano is applied and pressed with the Venetian smoothing trowel. The Venetian stucco is coloured with the same recipe or left white. The consumption for this is approx. 200 grams/m². You can feel the fine and smooth surface and the experienced user can hear how the trowel becomes quieter.

3) Final coating – Sealing

In order to protect the floor from wear and tear and dirt, we recommend a coating with PUR sealing. The surface becomes silky matt and is insensitive to dirt. Water does not penetrate the floor and can easily be wiped away. The hardness of the varnish makes the floor insensitive to scratches and easy to clean. Here you can read the details about the processing.

Dry paints and color pastes

Up to 10 % pigments (by weight) can be stirred into the putty. The lime cannot bind more and chalking would occur. If the dry paints, also called pigments, are stirred into the putty, a beautiful coloured mass is created. However, there is a high probability that pigment spots will appear. This means that some pigments will leave traces in the form of drivers or dots when filling the compound. This does not necessarily have to be a disadvantage, it can also be seen as a nice side effect. However, if you want to avoid these pigment spots, mix yourself with a color paste.

This is how it works: For 1000 g pigments approx. 800 ml liquid are used (160 ml wetting agent and 640 ml water). Pour the liquids into a container and add the pigments, stir well and grate; crush lumps at the edge of the container. Use a spatula, spoon or other. It is best to make a note of your mixing recipe in order to be able to produce the same shade again. Let this paste soak for at least 3 hours. However, the coloured dough can also remain overnight without any problems. During this time the container should be covered. Afterwards mix into the putty and stir well. The best mixing result is achieved if the contents are emptied into a separate bucket and mixed again well with a mixer. The putty is then immediately ready for use. Pigments have the highest colour intensity and set no limits to your creativity. However, you should only use lime-tolerant pigments.

The fillers, whether dyed or in natural white, can be stored for many years if stored correctly. For this purpose, the putty must be covered with a foil and the container sealed tightly.

Exception: Ultramarine blue must always be applied on the same day and cannot be stored.

Tip: If chrome oxide green, cobalt blue, titanium white or similar hard pigments are used, a Venetian PVC smoothing trowel is used for compacting. If you compact with a steel spatula, the pigments grind off the steel and metal abrasion marks are the result – grey stripes and stains.

Product information

Stucco Extra is a natural white putty for use on decorative walls and floors. Due to its high alkalinity, it is resistant to mould fungi. Highly vapour permeable.

Marble lime [Ca(OH)²], marble powder [CaCO³], cristobalite, water, cellulose.

approx. 2000 g/m² for 2 layers; depending on substrate and application, consumption may vary!

Specific weight:

Ph value:

Storage conditions:
Frost-free and in closed containers, covered with a PVC film and a layer of water, durable for many years.

Safety instructions:
R36/38: Irritating to eyes and skin.


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