Unweathered Pre-Painted Cladding

It is not easy to obtain adhesion to unweathered pre-painted metal cladding. To prepare such surfaces for painting, abrade all surfaces with fine grit sandpaper, stiff nylon bristle broom or similar, to improve the adhesion. Care should be exercised not to sand through the existing paint surface on external bends.

If the purpose of overpainting new cladding is to obtain a colour finish that is not available in pre-painted material, it is often more economical to order pre-primed material rather than try to overpaint an un-weathered pre-painted surface.