Surface Preparation

4a :Surface PreparationSpecificationsAugust 2004or dusting operation is being carried out, full protection from the dust must be maintained. Suitableequipment should include complete coverage of all skin and hair and a suitable respirator must beworn.SP615 Removal of Perished Paint by Burning Off:Procedure: Use suitable equipment capable of giving either a flame, or a blast of intense heat,that will soften the paint film. Hold the flame, or nozzle, at an angle about 2 centimetres fromthe surface and about 5 centimetres ahead of the scraper, which is used to remove the paint asit bubbles and softens. All burning off must be carried out in accordance with NZSS 2239:1980Section 501.5.2.1(A)Precautions: When wooden surfaces are being burned off, ensure that the wood is not charredby the flame. Keep the flame away from loose joints, knot holes, cracks, and from underside ofweatherboards. Ensure no easily ignited materials are concealed on the surface to be burned off, bythorough inspection of the surface before cleaning commences.SP616 Removal of Perished Paint by Chemical Stripper:Procedure: Apply a liberal coat of the stripper by brush to the surface of the film to be removed.Allow to stand until the paint is softened and then scrape the paint from the surface. Repeat theoperation until the removal is complete. Solvent clean the surface, in accordance with SP606, thensand in accordance with SP612.Precautions: Ensure adequate protective clothing and eye protection is worn.SP617 Removal of Mould and Mildew:Procedure: Using a hard brush, remove all loose and powdery deposits from the infected areas.Make a dilute solution of hypochlorite (household bleach) by diluting one part with three parts ofclean water. Apply this diluted solution to the infected areas by swabbing with a clean cloth. Allowthe solution to remain on the surface for 10-20 minutes (depending on intensity of growth) andrinse off with clean water. Apply second treatment if necessary. Allow to dry thoroughly.Precautions: Ensure adequate protective clothing and eye protection is worn.SP618 Removal of Moss and Lichen Growth:Procedure: Using a hard brush or broom, remove all loose and powdery deposits from the areasexhibiting the growth. Remove moss and lichen using a commercial moss/lichen remover. Rinse welland allow to dry fully.Precautions: Ensure adequate protective clothing and eye protection is worn.SP619 Removal of Chalk, Dirt and Dust:Procedure: Using a stiff bristle brush, dust the surface down. Excessive chalk, which remains afterthis treatment should be removed by scrubbing the surface with a stiff brush using clean water. Thesurface should then be hosed clean and allowed to dry.SP620 Removal of Grease, Dirt and Scum:Procedure: Wash down, using either hot or cold water, in which is dissolved soap powder ordetergent - or wash the surface with a commercial paint cleaner. This washing should be repeatedin the case of extremely dirty surfaces. After washing the surface as above, a thorough rinsing withclean water should be carried out. The surface should then be allowed to dry.4–8