When using the product, the complete product information must be observed.

TIPSHEET: Surface Preparation for Plasters

TIPSHEET: Application of Lime Plasters

 

SUITABLE SUBSTRATES

Indoors, on all solid and slightly absorbent substrates: mineral plaster, plasterboard, gypsum cellulose boards, concrete.

 

UNSUITABLE SUBSTRATES

Wood, chipboard, emulsion/dispersion paints, oil-based paints, plastic coatings, glue slurries. All glossy, non-absorbent and permanently wet surfaces.

 

RECOMMENDED TOOLS

– Venetian trowel (240 x 100 mm)

– Venetian trowel (200 x 80 mm)

– Steel trowel (200 x 80 mm)

 

SURFACE CONDITIONS

The surface must be dry, absorbent, coverable, solid, clean, dry, free of grease and any coloring substance that may appear by capillary action.

Tinted lime plasters must be applied on a completely dry surface, with uniform texture and absorption. Otherwise, different intensities of color and reflectivity may appear on the surface after drying. As a rule, limewash renderings may have a higher gloss when dry on non-absorbent or slightly absorbent surfaces.

 

SUBSTRATE PREPARATION

For coloured lime renderings, it is recommended to apply at least 1.5 mm of Tockay Lime Plaster 1.4 mm to the entire dry surface of the repaired walls or walls with differences in absorption or texture.

– Protect untreated surfaces

– Remove traces of glue and other chalky finishes

– Remove the remains of wallpaper paste

– Carefully brush off powdery backgrounds

– Allow new coating to dry completely

– Remove binder build-up from plaster surfaces

– Remove all formwork oil residues from the concrete

– Remove brittle, loose parts of plaster

– Repair cracks and holes with a similar material

– Block stained or colored substrates with substances that can form by capillary action with Alum Priming Salt, after the first lime wall finish has dried (test coat required)

– Clean mineral substrates affected by mildew with soda lye

 

PRIMER

On absorbent surfaces such as mineral plaster, gypsum plasterboard, gypsum cellulose boards and concrete, apply a coat of casein primer and let dry completely.

 

CONDITIONS

On absorbent surfaces such as mineral plaster, gypsum board, cellulose-gypsum board, and concrete, apply a coat of casein primer and let dry completely.

 

WORKING CONDITIONS

Do not apply the coating at temperatures below 8°C. Avoid direct sunlight, drafts, dirt, and surface temperatures below 8°C and above 25°C. Avoid drying too quickly. Low temperatures and high humidity in the air or building can create a higher gloss.

 

PREPARATION OF THE PLASTER

Pour the powder into the appropriate amount of clean, cold water, stir using a powerful mixer (a drill with a whisk attachment) and avoid lumps. Let stand at least 15 minutes, then mix again before use.

 

QUANTITY OF WATER TO USE

0.23 to 0.26 litres of water for 1 kg of powder. Adjust the mix of filler and water to suit the surface, as a little more water may be required for a particular application.

 

APPLICATION

Apply with a smoothing trowel, giving structure to the desired effect. Sponge, smooth, structure or polish/compress the lime plaster to shine depending on the desired effect. Maximum layer thickness: 2 – 8 mm.

 

WATER REPELLENT / HIGHER GLOSS

It is possible to waterproof the surface. For best results, apply Marseille soap to the dried surface as soon as possible, but no later than 24 hours after installation. Apply the soap with a brush, thinly and evenly, from bottom to top. Do not roll! After drying, repeat application if necessary. A characteristic whitish effect may appear on surfaces covered with stained lime (please test beforehand to verify).

 

REPAINTING AND RENOVATING

After drying, the lime plaster can be repainted directly with Tockay white lime paints. For lime tinted paints, apply casein primer beforehand. At least two weeks after curing, lime plaster can also be repainted with all other Tockay wall paints; use a suitable primer. Sand saponified lime renderings beforehand until absorbency is restored.

 

TINT

Lime plaster can be tinted with up to 5% Tockay pigments (maximum 50 g of pigment per kg of plaster powder):

– Form a paste by mixing the pigment(s) with a little water, then mix this paste with the lime plaster that has been previously mixed with water.

To tint, see our Tockay color chart.

 

DRYING TIME

Dry and overcoatable after approximately 24 hours per millimeter of thickness, at a temperature of 20°C and a humidity level of approximately 65%. Drying time is longer at lower temperatures.

 

CLEANING OF TOOLS

Clean with water immediately after use.