Rockcote Polymer Render

Rockcote Polymer Render is a high solids, thin section flexible render for difficult substrates. Tested by James Hardie and approved for use over their HardiTex ® Cement Sheeting .

Also suitable Exterior or Interior for correctly prepared: -

• Previously Painted Surfaces
• Masonry Surfaces, including clay brick and cement render
• A.A.C. – Hebel Blocks and Panels

A pre-mixed single component rendering material supplied ready for use in plastic pails. This product is designed to be used as a thin section render or patching compound over difficult substrates such as previously painted masonry, off-form concrete, A.A.C. [Hebel® panels or blocks] and cement sheeting. These substrates were either not suitable for normal cement render or could only be rendered with great difficulty and/or expense with unreliable results. Rockcote Polymer Render can be applied in a thin section over such substrates providing an attractive rendered finish with guaranteed performance.

PERFORMANCE and PROPERTIES

Adhesion and Flexibility

Modern construction methods and materials often require certain tensile properties from an exterior plaster coating, which cannot be achieved with standard or even modified cement renders.

The most important properties required are, adhesion to smooth dense or highly porous substrates, and flexibility and compatibility with finishing coats that are predominantly acrylic based. It must also be considered that modern construction components are typically manufactured to much closer tolerances, eliminating the need for heavy render coatings.

Economical

Rockcote Polymer Render can provide an economical and attractive rendered finish with an applied wet thickness of between 1.0 - 4.0mm. Polymer Render is a single component product which is completely free from both lime and cement. When used as directed Polymer Render can provide a stable flat surface for top coating with either paints or textured finishes. Polymer Render is high in total volume solids, providing a value for money solution to plastering difficult substrates.

Low Suction

Due to the low suction characteristics of Polymer Render, the dried finish does not usually require sealing or priming prior to the application of top coat paints or textured finishes, however over some high suction substrates priming before top coating may be required.

Limitations

• Polymer Render is not suitable for areas that are submerged or subjected to continual damp or hydrostatic pressure from within the substrate
• Polymer Render should only be applied to a total maximum wet film thickness of 4mm. Note that film thicknesses greater than 2 mm can take more than 24hours to dry under some conditions. If the total film thickness required is 4mm then best results are achieved by applying 2 or more coats at 1-2mm wet film thickness per coat. It is important to ensure that moisture is less than 15% WME at the thickest location before applying decorative topcoats.
• Polymer Render should not be applied in temperatures less than 5 ° C or higher than 35 ° C or in strong windy conditions
• Over painted walls with raked mortar joints, Rockcote Reno Render is recommended in preference to or before the Polymer Render to avoid excessive build of the Polymer Render and subsequent telegraphing of the joints. See Rockcote Specification on Levels of Finish
• Polymer Render must be over coated with a textured coating or paint as soon as practicable after it has dried.
• The moisture content of dried Polymer Render must be less than 15% WME before overcoating.

APPLICATION

Surface Preparation

All surfaces should be clean, dry and free from grease, oil or laitance and any loose material scraped back to a firm base. For masonry surfaces apply a coat of Rockcote Masonry Primer at the rate of approx. 6 - 8 square metres per litre. Deeper holes or deviations can be filled flush with Rockcote Skimcote and allowed to dry prior to the application of the Polymer Render. For smooth painted surfaces apply Rockcote Texprime at a rate of approx. 5 - 6 square metres per litre before the Polymer Render.

Polymer Render may be trowelled on to the surface in one or two applications and finished with a plastic or polystyrene float after 15 to 30 minutes drying. A sponge finish is usually achieved by rubbing the surface gently with a soft sponge after approximately 15 to 30 minutes drying.

Cement Sheeting - Recessed Edge

Refer to Patching Specifications

Refer to Rockcote System Chart for Cement Sheet

STORAGE, SAFETY and HANDLING

Refer to the Rockcote MSDS for Polymer Render

• Pails should not be stacked more than three high during transportation and should be stored out of direct sunlight and above 4 0 C
• In the case of Polymer Render, if ingestion occurs, drink at least two glasses of water and consult a doctor as soon as possible
• Wear protective clothing to minimise skin contact and wear goggles where spatter is likely.
• Avoid prolonged skin contact and particularly eye contact. If eye contact occurs, flush thoroughly with clean water and see a doctor as soon as possible
• Where spills occur, soak up liquid spillage with sand/sawdust and dispose of in accordance with council regulations
• Clean up equipment and area with water. Do not permit run-off to sewer, storm water or open bodies of water

Indemnity

Rockcote Enterprises Pty Ltd will not accept responsibility for any misuse of this product or if not applied by a skilled and experienced applicator and in accordance with our technical specifications.

Due to our policy of continuing product improvement Rockcote Enterprises Pty Ltd reserves the right to change these specifications without further notice.