Metals (iron, steel, wrought and cast iron) - doors, cabinets and trimmings
While steel in its various forms is usually used for its structural strength, it does need to be protected from atmospheric pollutants, water and other chemicals which cause corrosion. Once started, corrosion is a self-perpetuating process and can quickly lead to serious weakening of structures and building fabrics, as well as unsightly rust stains on concrete or coated areas.

Surface preparation:
It may cost a little more for a well prepared surface, but as the paint coating will last many times longer the overall cost saving in maintenance will justify the initial expense.

1. Greasy Surfaces:
   Mix one part of Resene Roof Wash and Paint Cleaner with three parts of fresh water. Apply a liberal wash of this mixture to the surface, with a nylon bristle brush or broom. Thoroughly scrub the surface to ensure complete removal of all grease and other contaminants. Rinse thoroughly with fresh water and allow to dry.
   
   
2. Treat any moss or mould:
   Treat with Resene Moss & Mould Killer, correctly diluted with clean water. Leave for up to forty eight hours to achieve full kill. For heavy infestations further applications may be needed. Wash thoroughly with clean water to remove residues.
   
   
3. Remove flaking paint:
   Either totally remove or at least remove all loose flakes. This can be done by either waterblasting, hand tool cleaning or power tool cleaning as detailed below.

• Waterblasting:
  Carefully waterblast at 3000 psi to remove all dirt, chalk, moss and mould residue, any loose and flaking paint and other contaminants. Allow the surface to dry out for at least twenty four hours.

• Hand tool cleaning:
  Hand tool clean to remove all loose mill scale, loose rust, loose paint, and other loose detrimental foreign matter. It is not intended that adherent mill scale, rust, and paint be removed by this process. Mill scale, rust and paint are considered adherent if they cannot be removed by lifting with a dull putty knife. Hand wire brushing, hand abrading, hand scraping or other similar non-impact methods are acceptable for the removal of loose mill scale, all loose or non-adherent rust and all loose paint. Stratified rust (rust scale) and weld slag must be removed using impact hand tools. Regardless of method used for cleaning, feather edges of remaining old paint so that the unpainted surface has a reasonably smooth appearance.

• Power tool cleaning:
  Power tool clean to remove all loose mill scale, loose rust, loose paint, and other loose detrimental foreign matter. It is not intended that adherent mill scale, rust and paint be removed by this process. Mill scale, rust and paint are considered adherent if they cannot be removed by lifting with a dull putty knife. Power wire brushing, power abrading, power impact or other power rotary tools are acceptable methods for removal of loose mill scale, all loose or non-adherent rust, and all loose paint. Do not burnish the surface. Use rotary or impact power tools to remove stratified rust (rust scale) and weld slag. Operate power tools in a manner that prevents the formation of burrs, sharp ridges and sharp cuts. Regardless of the method used, feather edges of remaining old paint so that the repainted surface can have a reasonably smooth appearance.

First coats:
Surfaces must be primed immediately or at least within a few hours of preparation to avoid flash rusting by contamination from salts and moisture in the atmosphere.

Apply two coats of Resene Rust-Arrest at between 12-16 square metres per litre.

If the surface you propose to paint is already painted and in good condition, then you can go straight to the Topcoats below.

Topcoats:
Apply two coats of either Resene Enamacryl (gloss) or Lustacryl (semi-gloss) - waterbased enamels at approximately 12 square metres per litre. These products perform like solventbased paints with the added benefits of non-yellowing, fast drying and low odour when compared to solventbased paint.

Follow label instructions at all times.

Cleaning up:
Cleaning up waterbased paints is different to solventbased paints - click here for detailed instructions on clean up.