Crown Rockfast Hi-Build Textured Finish

Crown Rockfast Hi-Build Textured Finish

SKU: C21AC. Categories: , .

Product Description

Rock-Fast is a tough, high-build, textured coating incorporating a mould resistant fungicide, and designed for the long-term exterior protection of commercial and domestic buildings.

Rock-Fast can be applied to new and previously painted plaster, cement rendering, block work, concrete, stone, bag-washed surfaces and fair-faced concrete. Rock-Fast, can also be applied to asbestos and timber surfaces including chip-board, blockboard, plywood etc. On internal walls and ceilings, Rock-Fast produces an attractive and fashionable tough coating.

Characteristics: Based on a tough co-polymer emulsion and high quality pigments, Rockfast incorporates a variety of rock aggregates and a mould resistant fungicide. Thixotropic consistency.

Advantages: Unique formulation, provides maximum long term durability in the most severe tropical and coastal climates. Attractive, high-build textured finish which will disguise wall surface imperfections and patchiness (variation in substrate texture and porosity) often found on cement rendered walls that cannot be disguised by normal decorative paints.

Finish: Matt, high-build, heavy textured finish.

Application/Texturing: Rockfast should be applied with a large (short bristled) brush and spread evenly over an area not exceeding one square metre. Once the area has been coated the surface should be laid off horizontally with the brush and immediately textured (within 5-10 minutes of initial application) with a special Rockfast roller. Texturing should be performed horizontally / vertically with minimal pressure. Over rolling should be avoided.

Thinning & Mixing: Rockfast is supplied ready for use and UNDER NO CIRCUMSTANCES SHOULD THE PRODUCT BE THINNED.

Drying Times: Surface dry: 2-4 hours. Hard dry: 24 hours in normal dry conditions. Attains maximum toughness after several days.

Spreading Capacity: Rock-fast should be applied in high-build form at the rate of approximately one kilo per square metre.

On smooth, steel-float plaster or on fair-faced concrete approximately 1 – 1.1 kilo of Rock-fast should cover one square metre, on a normal wood float/cement rendered surface approximately 1.1 kilo – 1.3 kilos of Rock-fast should cover 1 square metre. Coverage will be reduced when applying Rock-fast to rough textured surfaces.

Equipment Cleaner: Water.

Colour range: Rockfast is supplied in a range of attractive colours plus White.

Pack Sizes: 25 kilos, 5 kilos.

Availability: From Crown Depots in Nairobi, Mombasa, and Kisumu and through Crown Stockists.


New Work: Prepare surface (refer surface Data Sheet SP 1). Apply 1 coat Rock-fast.

Previously Painted Surfaces in Sound Condition: Prepare surface (do not apply Rock-fast over previously gloss painted surfaces). Apply 1 coat Rock-fast.

Loosely Bound Surfaces: Prepare surface (refer surface Data Sheet SP 2). Apply 1 coat Crown Penetrating Primer. Apply 1 coat Crown Rockfast.


The application of Rock-fast over surfaces previously decorated with cement paint or lime wash is not recommended. Never apply Rock-fast over powdery, chalky, and flaking paint without thorough preparation and priming.

For health & safety information, please refer to our Material Safety Data Sheet (MSDS)

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