Aluminium and its alloys are widely used in building construction in the form of flat or ribbed sheets, extruded sections and cast components.

Aluminium, as a metal, is largely self-protective because of its oxide layers. However, it may require painting for decorative purposes or for protection when faced with severe corrosive conditions.

Preparation

Sheets and extruded sections have smooth, shiny surfaces and require pre-treatment in order to obtain a satisfactory key for paint.

Cast aluminium requires no pre-treatment other than the removal of grease and dirt.

New surface
Clean to remove grease, dirt and oil by using a suitable concentrated detergent.

Previously painted non ferrous metal
If the paint is in poor condition:

• remove it.

If it is in good condition:

• clean thoroughly with a suitable solvent.

If it is glossy:

• sand the surface.
  

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