Scumble Filler

Substrate and preparation
To achieve the best possible results, please refer to the technical data sheets for all products used. The substrate must be chemically neutral, sound, dry, clean, free from grease and dust, free from any substances that might bleed through, and as smooth as possible. Rough, grainy or wallpapered surfaces are unsuitable and must be prepared accordingly. Very smooth surfaces can be achieved by first applying LEINOS Interior Smoothing and Texturing Filler; this is also the best way to achieve the refined and exclusive look associated with the spatula technique. Unusual patterns can be created, for example, by first painting the surface with LEINOS White Emulsion Paint Plus: Here, the brushstrokes from the initial coat of paint remain visible through the glazing technique applied with a palette knife. Experiment with the various possibilities offered by a transparent filler such as LEINOS Scumble Filler. To achieve pastel shades, use half Pigment Concentrate 668 white and another coloured one Pigment Concentrate.

Processing
Using Japanese putty knives or similar suitable putty knives. Room and surface temperature above 15 °C.

New, untreated plaster and plasterboard surfaces:
These include, for example, gypsum, lime or cement plaster, plasterboard or gypsum fibreboard, or even concrete. To reduce their high absorbency, the aforementioned substrates must be LEINOS water-based Deep Sealer must be primed. Smooth, well-finished gypsum plasters can then be finished directly using the LEINOS glazing and filling technique. Lime or lime-cement plasters, as well as concrete surfaces, must first be smoothed using LEINOS Interior Smoothing and Texturing Filler. Plasterboard and gypsum fibre boards can either be completely re-smoothed or treated with LEINOS White Emulsion Paint Plus be primed, depending on the desired effect.

Old paint and wallpaper:
Existing emulsion paint on render, plasterboard, etc. must adhere firmly and can be painted over without prior priming using LEINOS White Emulsion Paint Plus crossed out or with LEINOS Interior Smoothing and Texturing Filler must be smoothed. Heavily soiled existing paint layers should be cleaned beforehand. Distemper and flaking existing paint layers must be removed completely. Dense, barely absorbent substrates, such as latex or gloss paint coatings, must be sanded down very thoroughly and treated with a lye solution; the surfaces can then be LEINOS Interior Smoothing and Texturing Filler must be smoothed out. Wallpaper must be removed completely.

Mixing the Scumble Filler:
LEINOS Scumble Filler is ready to use. A small container of LEINOS Scumble Filler (0.75 l) will cover approximately 15 m² per application, depending on the application thickness and the type of finish. Mix the required quantity LEINOS Pigment Concentrate Add it to the LEINOS Scumble Filler and stir well. Start with a small amount Pigment Concentrate and carry out some preliminary tests, e.g. on a piece of plasterboard. Add approx. 10 per cent LEINOS Pigment Concentrate you will already achieve a very rich colour. For delicate shades, try adding just approx. 1–2 per cent. If you’d prefer a more pastel shade, add a few per cent of white LEINOS Pigment Concentrate. Please note: Adding more than approx. 10 per cent LEINOS Pigment Concentrate does not result in a significantly deeper shade, but merely provides greater coverage of the filler layer.

Applying the Scumble Filler:
For larger areas, a so-called Venetian trowel with rounded corners and edges is generally used. Smaller areas can also be worked on with a Japanese spatula, depending on the desired effect. Applying the material with a Venetian trowel produces larger-scale textures, whilst the Japanese spatula is used to achieve the so-called ‘speckle’ technique. Lively surfaces are achieved by applying two different shades one after the other, with the first layer of filler allowing the second – translucent – layer to show through. More subdued surfaces are achieved by applying the same shade two or more times.

Application using a Venetian trowel:
As a rule, two very thin layers are applied to the prepared surface. The first layer is applied evenly across the surface and – depending on the desired effect – to provide a largely opaque finish. Hold the trowel very flat and apply with only light pressure. Keep changing the direction of application and vary the thickness slightly – sometimes applying a thinner layer, sometimes a thicker one. Overall, however, you should not exceed a maximum application thickness of 1 mm to prevent shrinkage cracks from forming; in this case, less is more. Depending on the ambient conditions, the second coat can be applied after approximately 2–3 hours. This coat should be a different shade and should also be applied thinly. This coat is usually translucent, so that the first coat remains visible and the combination of both colour coats creates a new, interesting interplay of form and colour. Depending on your personal preference, as many further colour coats as you like can be applied gradually. Very good results are usually achieved with just 2–3 coats.

Application using the Japanese spatula:
The Japanese trowel is ideal for the ‘spot’ technique, which is in turn best suited to smaller areas such as pilasters, projections or chimneys. In the first pass, small trowel strokes (‘spots’) are distributed evenly across the wall. Initially, larger gaps remain, which are then filled in during a second pass. This technique uses the least amount of material, as only wafer-thin layers are applied. In a further step, using a second colour, the entire surface is coated once more. This enhances the contrast and adds ‘depth’ to the surface.

TIPS & TRICKS:

- Soft, low-contrast textures can be achieved by applying two coats of paint with a Venetian trowel, using colours that are very similar – that is, ‘tone-on-tone’.
- If you want to mix very light shades, do not use less of the desired Pigment Concentrate; instead, add white Pigment Concentrate. For example, you can achieve a very lovely, light shade of yellow by adding approx. 2–3 per cent. LEINOS Pigment Concentrate Corn yellow and approximately 5–10 per cent LEINOS Pigment Concentrate white.
- If you want to achieve very rich to dark shades, you can add approx. 10 to a maximum of 20 per cent to the Scumble Filler LEINOS Pigment Concentrate apply. If you are treating the substrate with LEINOS White Emulsion Paint Plus If you want to apply a base coat, you can tint it a little more heavily straight away.
- Measure out your pigment using a syringe from the chemist’s; this way, you can reproduce the exact same shade whenever you like.
- When applying the product, make sure you move the spatula in a different direction with each stroke to avoid creating a pattern that is too uniform.
- Do not apply the material too thickly. The Scumble Filler is designed only for thin-film application, with a maximum wet film thickness of 1 mm per coat.
- A final coat of wax followed by polishing enhances surface protection.
- The LEINOS glazing and filling technique also combines extremely well with the stencilling technique.

Drying time
Can be coated again after 2–3 hours; can be polished after approx. 24 hours.

Consumption
Between 30 and 70 g/m² per pass, depending on the type of design and application method.