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Description
A 3 - 5mm coloured, waterproof, fibre-reinforced plaster.
Purpose
To provide a 3 - 5mm thick tough, mottled, coloured exterior or interior plaster onto conventional wood-floated- or scratch plaster that is UV resistant and unaffected by water.
Limitations
Concrete and coloured plaster are susceptible to non-uniformity of colour, unless precautions are taken in applying the coloured plaster onto areas of even suction. The unsightly "smiling" of the bricks through the plaster is caused by different suction and curing of brick and mortar joints. Work from one architectural feature to another, always keeping a wet edge. Patching will cause variations in colour.
Specifying
"Cemcrete Cemplaster to be applied in one coat, not thicker than 5mm, over conventional wood-floated- or scratch coat plaster."
Specimen finish
A trial area should be treated on-site for the architect's approval.
Site Work
Storage
Can be stored in a dry shed off the floor on wooden slats for 4 months.
Weather
To avoid efflorescence, do not use in cold, wet weather.
Curing
Leave to dry for 1 day
Cure by wetting with clean water 3 times during the next day
Leave to dry for 7 days.
Sealing
Apply one good coat of Cemcrete Siliconseal Solvent by brush, roller or spray in accordance with its data sheet.
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Surface preparation
Base plaster
All brick surfaces to be clean, properly cured and hard. Plaster mix to be 1 volume ordinary Portland cement, 3 volumes clean plaster sand and 1 volume clean river sand. Apply and finish with a wood float or scratch back when biscuit hard. All completed plaster to be cured by damping 3 times with clean water on the day following
application. Plaster must be allowed to cure for at least 28 days prior to application of Cemplaster.
Mixing
Mix 3 volumes Cemplaster with 1 volume clean water. The Cemplaster mix should have no slump, but be workable.
Application
Final coloured coat
Thoroughly dampen the surface to be treated with clean water on the day before application. If the wall is in direct sunlight, dampen a few hours before. Mix Cemplaster to a thick plaster consistency using clean water only. Final thickness should not exceed 5mm. Strike off level and finish using one of the following methods:
- Brished: brush using a large, slightly wet paintbrush while the plaster is biscuithard scratch the surface when biscuit-hard
- Scratched: using the edge of a steel float to pull out the larger aggregate, leaving a rough "scratched" finish
- Sandstone: lightly acid-wash the finished cured plaster to expose the special aggregates to emulate "sandstone" blocks or panels. Dampen the plaster well and apply a dilution of 1 volume hydrochloric acid mixed with 5 volumes clean water evenly over the surface. Allow to react for about 10 minutes and flush with clean water.
- Sponged: finish with a damp sponge
- Smooth: finish using a steel float, being careful not to "burn" by over-trowelling
- Wood float: finish using a wood float
Curing
All plaster work to be cured by wetting with clean water 3 times on the day following the day of application.
Coverage
Approximately 4 - 5m2 per 40kg bag.
Sealing
After all work is completed and well cured, mask all windows, etc. and apply one good coat of Cemcrete Siliconseal Solvent by brush, roller or spray. See Siliconseal data sheet.
Packaging
In 40kg non-returnable paper bags.
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Cemcrete Products 
