Dulux Copper Effect can be applied over previously painted surfaces that are in good condition. For optimum appearance a perfectly smooth surface free of defects is required. Differences in surface gloss or variations in surface porosity can result in uneven colour and patchy appearance. Previously painted surfaces in good condition: Dust, then clean with Selleys® Sugar Soap. Previously painted surfaces with cracks or holes repaired with filler: Spot prime repairs with Dulux Prepcoat Acrylic Sealer Undercoat. Glossy surfaces: Lightly sand to a dull finish. Unpainted plasterboard, brick, cement sheet, bare timber: Apply one coat of Dulux Prepcoat Acrylic Sealer Undercoat. Unpainted set plaster, fibrous plaster, plasterglass: Apply one coat of Dulux PRECISION® Sealer Binder. Unpainted metal surfaces: Thoroughly degrease and apply Dulux PRECISION® All Metal Primer.