Document type Technical Data Sheet

 

Name MARMARETTO VELVET

Description Natural, lime-based material for decorative finishes on interior and exterior wall

surfaces. Naturally anti-mould and breathable. It is one of the most elegant lime-based

decorative finishes rendering a variety of aesthetic possibilities. Its slightly rough and

matt finish is velvety to the touch with the typical chiaroscuro appearance of fine suede.

Composition Aged, slaked lime and selected marble powders.

Grain size 300 microns

Appearance Paste

Colour White, it can be tinted in any colour with lime-compatible colourants

Packaging 24 kg net polyethylene containers

16 kg net polyethylene containers

Application By hand, with a steel trowel

Type of Surface Interior and exterior walls.

New Wall Surface

Plaster: no priming necessary

Gypsum / Plasterboard / Medium Density: one coat of QUARTZ PRIMER

Old Wall Surface

Plaster: one coat of QUARTZ PRIMER

Fast drying / Limewash: brush down and apply one coat of QUARTZ PRIMER

Polished Lime: Abrade, brush down and apply one coat of QUARTZ PRIMER

Washable Paint: one coat of QUARTZ PRIMER

Dilution Ready to use

Consumption 2.1 kg/m2

Drying 3 hours at 20°C / 68°F to the touch

48 hours at 20°C / 68°F below the surface

180 days stable

Application temperatures min 5 max 30°C – R.U. < 85% ca

Coat Thickness 1.4 – 1.6 mm for a total of 3 coats

VOC Classification EU Directive 2004/42/CE: EU limit value for this product (cat A/l – water-based

decorative effect coating): 200 g/l (2010). This product contains less than 1 g/l of VOC.

Specific Weight 1.4 ± 0.2 (kg/l)

pH after 30 days 12.5 ± 0.50

Vapour Permeability SD ~ 0,04 m (DIN 52 615)

Flammability European Class of Reaction to Fire A1: non-combustible, no contribution to fire

Mould Resistance ASTM D 3274 – “Standard Test Method to evaluate the degree of surface

disfigurement of paint by microbial, fungal and algae growth.

Result: Front Panel 10/10/10 Back Panel 10/10/10 = no growth

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Scrub Test Resistance ASTM D 2486-06 method A = was used: scrubbing fine sand + metallic brush for

10,000 cycles

Impact Test UNI EN ISO 6272-2-2006. 1 kg doming punch was dropped from different heights and

only at the height of 8 cm., it left a 5.5 mm. dent in the surface and a tiny crack

appeared around its circumference.

Pencil Hardness ASTM D3363- Pencil hardness 5H

Shore Hardness Norm ASTM 2240 average

Adhesion Norm UNI EN 13892-8 2004 average value = 2,0

Shelf life 36 months when stored according to the recommended guidelines

Storage In original sealed packaging between 5° - 35°C in a dry, dark environment

Safety Norms Irritating. / Risk of serious damage to eyes. / Irritating to the skin. / Keep out of children.

/ Avoid contact with eyes. / In case of contact with eyes, clean immediately with water

without rubbing them, and consult a doctor. / Wear suitable gloves and eyes / face

protection. / In case of ingestion of the products, consult immediately a doctor showing

him the can or the label of the product. Danger labelling under directives 67/548/EEC

and 1999/45/EC nd following amendments and adjustments. The product must be

transported, used and stored according to current standards of hygiene and safety.

Disposal Product must be disposed of according to norms and regulations in force. Containers

must be sent for recycling. Follow directions on the packaging

Application Instructions WARNINGS

We recommend using materials from the same production batch for the same project.

If you must use different batches, we suggest mixing their material together to avoid

any slight variations in shading.

To ensure proper usage, dilution, and application of the products mentioned in these

pages, please consult the corresponding technical data sheets.

When preparing the surface and applying the materials, we advise using appropriate

tools and personal protective equipment (PPE).

During application and for the following 72 hours, protect the surfaces from sudden

temperature change, direct sun light and water. Don’t apply in temperatures below 8°C

or above 35°. During application make sure that the work area isn’t too damp to avoid

problems with application times.

Remember to have a strong light parallel to the wall and situated on only one of the

two sides of the wall you are working on (usually on the same side as other sources of

light such as windows). In this way the shadow of the trowel allows you to see the

actual state of the finish. Every so often, during the second and third coat, the light

should be moved so that the wall doesn’t dry out too much in one spot from the heat of

the lamp.

APPLICATION

Protection of the work area: Masking tape and protective material over the baseboards

and around windows and doors.

Priming: One coat of QUARTZ PRIMER is applied with roller or brush to a uniformly

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smooth, clean surface and allowed to dry completely (3-5 hours). It is necessary to

apply the primer on all surfaces with the exception of plasters made of lime and sand.

These have a similar composition to MARMORETTO.

Colouring: After opening the container of Marmoretto Velvet, remove any water on

the surface, and mix for about 30 seconds using an electric mixer until homogenized.

Add the colouring pigment and mix until the colour is completely uniform. Remember

that lime loses its viscosity once shaken. If the material, after mixing, is too loose, allow

it to rest for 6 to 8 hours before using.

1. FIRST COAT: Apply a thin, even coat of Marmoretto Velvet over the entire

surface with a metal trowel. Avoid making too many ridges and allow it to dry

completely (6-8 hours). The first coat can be white even if you plan too have a coloured

finish. If the final colour will be dark it is best to remove the masking tape from around

doors, windows and baseboards and reapply it; otherwise, a strip of white may be

visible when the tape is finally removed. Therefore, remove the tape and replace it

approximately 1/16” distant from the original position of the tape.

2. SECOND COAT: if you apply the second coat as evenly as possible with a metal

trowel you will get little or no dark and light effect, but if you apply it “badly”, that is with

area with more material close to areas with less, you will get more dark and light effect,

especially with dark colours. In alternative to increase the chamois effect (dark and

light), you can damp the walls lightly and not evenly just before applying the second

coat. Some areas will remain damper than others, which will result in a surface with

both smooth and rough areas after the final smoothing phase. To do this coat, make

sure the blade-edge of the trowel is always clean and free of imperfections. The edge

can be cleaned with P360 sandpaper. Usually the second coat is applied over the

entire surface before applying the third coat. But on large surfaces in hot, dry

conditions it might be necessary to have a second person begin to apply the third coat

while the first completes the second coat.

3. THE THIRD COAT should be applied before the second coat has dried completely.

To recognize when this is, you should observe that the water that was on the surface

has been absorbed, but the plaster still appears slightly damp. The second coat should

have almost completed the shrinking process that typically occurs with lime-based

products. With ideal room temperatures, this occurs after about 15 minutes, the time it

usually takes to apply the second coat to a medium-sized wall. The third coat will be

applied over this even surface. No undue care need be taken when applying it since

this final layer will be smoothed out almost immediately with a dry SPONGE FLOAT.

4. It is difficult to say how much time you need to wait before using the SPONGE

FLOAT because it depends on how absorbent the wall is and what the temperature is.

You’ll know if is too soon because you will see small ridges forming as you use the

SPONGE FLOAT. Generally, the plaster should be damp enough to be able to smooth

the surface moving the SPONGE FLOAT in opposite sweeping directions several

times. This will fill in pits and flatten ridges without leaving marks on the wall. The

SPONGE FLOAT will need to be cleaned from time to time of excess MARMORINO

which has accumulated on its surface. To do this, gently scrape the surface of the

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SPONGE FLOAT on the edge of a metal trowel, and then scrape the excess

MARMORETTO into a container to be reused later.

5. Before it dries completely, go over the wall with a metal or plastic trowel which has

smooth, rounded edges. As when using the SPONGE FLOAT, you will know when to

perform this phase of the smoothing process by observation. It is too early to use the

plastic trowel when you leave small ridges in the plaster and too late when you are

unable to smooth out the roughness left from using the SPONGE FLOAT. Note that

with very light colours, the steel trowel could leave a grey mark like a veil on the

surface. Because of that, it is suggested to use a plastic trowel or our BIANKO titanium

trowel.

6. The trowel should be pressed almost flat on the wall (with a 25-30° angle) moving it

in opposite sweeping directions to avoid making ridges. It is advisable to use a strong

light source parallel to the walls when smoothing out the surface to detect

imperfections you may create while moving the trowel over the surface. The wall will be

finished when it appears almost shiny when viewed against the light. You will observe -

especially with darker colours – that the smoothest parts appear the darkest.

7. Remove all tape and protective material before the plaster is completely dried to

avoid chipping and cracking along the taped edge. In fact, the tape can be removed

right before the last phase where you use the plastic trowel.

SPECIAL EFFECTS

This versatile material can achieve several special effects:

Veiled effect

Once it is completely dry, the finish can be given a distinctive colour patina using our

water-based VELATURA. This transparent liquid product can be tinted in any colour

allowing you to obtain a variety of effects from an antique patina to an artistic look with

a strong visual impact. It is always advisable to try out the colour on a sample board or on

part of the wall which is not so visible. Our metallic glitter or pearlescent waxes can also be

used to get veiled effects.

Damask effect

A Damask effect can be obtained by applying a very thick second coat of Marmoretto Velvet

and passing over it immediately with a completely flat, metal trowel always

moving in the same direction (orizzontali or vertically). Ridges will be formed in this way

which should then be pressed down lightly with a plastic or metal trowel before drying.

Other Effects

You can use a metal trowel instead of a plastic one in the final phase of the smoothing

process to leave dark marks on the finished surface. These are transferred from the metal

trowel to the smoothest areas. This effect is used mostly on dark finishes. To make the finish

feel more velvety to the touch, you can sand the surface lightly (not before 48 hours from

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drying) with paper P 220-360 (this moves up the cellulose fibers) and then brush off the

dust.

EXTERIORS: 

For exterior applications there are some rules to respect and some

precautions to take. We remind you that carbonation, i.e. the process that takes place

through the absorption of atmospheric CO2, is completed in a few hours on the surface

but takes several days to take place in depth. It is therefore important that the

application takes place in the certainty of the absence of heavy rains in the three

following days. It is also not recommended to apply it on walls that do not have at least

a small roof overhang. Penetrating rain could ruin the finish even after weeks as deep

carbonation is completed after more than a month. Avoid windy days, especially at high

temperatures, as well as the risk of frost in the 48 hours following application. In

external applications in hot climate conditions, it is also recommended to protect the

wall from the sun with shade cloths applied to the scaffolding. Lime-based products

must dry slowly to better fulfil their characteristics.

Finish Protection

(optional)

INTERIOR: PROTECTIVE WAX / HYDROCALCE / SOFT TOUCH

EXTERIOR: HYDROCALCE

A protective treatment is optional in most circumstances. It is however necessary in

bathroom walls, kitchen, and splashback walls. On exteriors, protective treatments are

obligatory only in highly polluted cities.

On Interiors, one of the following options can be chosen:

A) Apply our PROTECTIVE WAX which guarantees waterproofing and protection

against all types of dirt. There are two kinds available: MATT and GLOSSY, which

increases shine on Marmoretto Velvet. Apply it, diluted to 70-100% with water,

preferably with a spray bottle.

B) Apply HYDROCALCE after about 72 hours at at least 20°C., proceed with the

application of the colourless protective impregnation HYDROCALCE, especially

designed for the protection of lime-based coatings. Its Installation is done by brush in

two coats, with a consumption of about 100-130 g/sqm.

C) SOFT TOUCH, a one-component water-based polyurethane varnish with a soft

touch effect can be use to protect Marmoretto Velvet while providing an enhanced

velvety touch

Exteriors

This finish, as all lime-based plasters, absorbs water during rainy weather, which

results in a temporary "wet effect" on the surface. However, this plaster releases the

absorbed water within a few hours, allowing the surface to dry without any damage nor

alteration to the finish. While a final treatment is therefore optional, it is highly

recommended in areas with high pollution levels or if you wish to avoid the temporary

wet effect that can occur after rainfall. To protect the finish, after at least 72 hours at a

minimum of 20°C, proceed with a colourless, penetrating HYDROCALCE, developed

to protect exterior plaster coverings.

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Maintenance To clean natural finishes with no protection: The most practical way to clean this type

of finish is with a white pencil’s rubber eraser or sandpaper (P 220-320). It’s very easy

to clean most dirty areas by simply using sand paper and dusting off the powder

residue.

Tools SI TROWEL, SCRAPERS, SPONGE FLOAT VELVET

Clean with water immediately after use

Decorative complements

(optional)

VELATURA

We have drawn up the material presented above to the best of our technical and experiential knowledge. Nevertheless,

our suggestions and recommendations are not guaranteed. All responsibility for the obtained results lies solely with the

method and conditions adopted for the application of the product. Such indications constitute valid support for verifying

the product's suitability for the specific case. We reserve the right to make modifications to the present information