Substrate preparation:

Apply to a sound and clean substrate (without cracks and delaminations), degreased, even, dry, and free from biological or chemical efflorescence. The substrate should be free of algae/fungi growth.

In case of microbial contamination, the substrate should be cleaned with a power washer. Subsequently, a biocide solution for removing microbial contamination is to be applied as per the product manual. Any loose layers not bound to the substrate (such as loose plasters or flaked paint coats) should be removed. Wash and degrease old and/or dirty substrate with water and a cleaning agent.

Smooth substrates require a scratch coat to be applied before TERRIX® RN-LP application.

Preparation:

Use a container with a measured amount of clean water (5.5–6.0 litres per 25 kg of plaster). Gradually add the entire contents of the bag while continuously mixing with a low-speed drill fitted with a basket mixer, until a smooth, homogeneous and lump-free consistency is achieved. Leave the mixture to rest for approximately 5 minutes to allow the initial chemical reaction. Mix again briefly just before application. Depending on temperature and humidity, the prepared mix remains workable for approximately 2 hours. If necessary, add a small amount of clean water (maximum 0.1 litre per 25 kg of product). The quantity of added water may vary for different substrate types, weather conditions and application methods.

Application method:

Apply Terrix® RN-LP to the prepared substrate with a stainless-steel trowel or, on large areas, by means of a plastering pump. Level immediately, then bring the fines to the surface with a sponge or felt float to achieve an open-pore finish.

Recommended thickness per pass

• Interior ceilings and walls: 8 – 12 mm (absolute minimum 10 mm where levelling is required).

Building up greater thicknesses (> 15 mm)

When a total build-up thicker than 15 mm is needed, apply the plaster in successive passes:

• First pass – apply and rule off to the desired depth, keeping within the 8 – 12 mm range.
• Waiting time – allow the coat to reach a green or thumbprint-hard state (firm to the touch yet still moist).
• Second and subsequent passes – re-dampen the surface lightly if it has started to dry, scratch lightly for a mechanical key, and apply the next pass.
• Finishing – float the final pass as above and cure with a fine mist of water if ambient conditions are hot or windy.

Avoid placing two fully wet coats one after the other; letting the previous coat stiffen minimises sliding, trapped moisture and shrinkage cracking while still ensuring excellent inter-coat adhesion.

Warning:

The product is alkaline. Use PPE to protect the eyes and skin. During work, use protective clothing. When in contact with the eyes, rinse immediately with plenty of water. If irritation occurs, contact a doctor. Refer to the safety data sheet.

Drying:

The typical binding time is approx. 1 mm of the product per day (15°C, 55% RH).

Note:

The final appearance will vary with the nature of the background. On irregular or highly profiled substrates—such as hollow-block masonry with deep joints—first apply a thin levelling (skim) coat across the whole area. Allow this skim to reach a green, thumb-firm state and then apply the body coat while it is still lightly damp (“green-on-green”) to ensure a uniform finish and secure inter-coat bond. 

Useful hints: 

All tools should be cleaned with water after work is completed.
If drying occurs too quickly, shrinkage cracks may appear — to repair them, use a v-tool to widen the cracks and fill them with Terrix® RN-LP.