Specification for liquid organic coatings for application to aluminium alloy extrusions, sheet and preformed sections for external architectural purposes, and for the finish on aluminium alloy extrusions, sheet and preformed sections coated with liquid organic coatings|Mortars, Conversion coating, Extruding, Aluminium alloys, Metal sections, Test specimens, Construction materials, Corrosion tests, Finishes, Chemical-resistance tests, External, Acetic acid, Organic coatings, Windows, Liquids, Adhesion tests, Specimen preparation, Thickness, Salt-spray tests, Pressure testing, Testing conditions, Paints, Dimensions, Solvent-resistance tests, Coatings, Cleaning, Weather resistance, Protective coatings, Surface treatment, Sheet materials