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PAINTED METAL SURFACES:

  • Abrade the painted surface to remove contaminants/gloss.

  • Wash down thoroughly with Hammerite Brush Cleaner & Thinners, a proprietary metal degreaser or diluted detergent both for removal of surface contaminants and soluble salts.

  • Rinse with clean water.

  • Allow to dry.

  • Test for compatability with existing paint by painting a small test area first. Any compatibility problems will be evident within the first hour after application.

SHINY, SMOOTH METAL SURFACES:

  • Abrasion is required to ensure maximum adhesion.

  • Degrease with Hammerite Brush Cleaner & Thinners, a proprietary metal degreaser or diluted detergent both for removal of surface contaminants and soluble salts.

  • Rinse with clean water.

  • Allow to dry.

  • Apply a phosphoric acid etch primer (mordant solution) to convert the galvanised steel zinc surface before application of DTG.

FOR RUSTED METAL SURFACES: Preparation and treatment of corroded galvanised steel varies dependent on the severity of corrosion. Corrosion can be divided into 3 main categories as follows:

  • Light White Rusting – this would appear as a light white powdery residue which typically forms during heavy rain. This can simply be brushed off using a bristle type brush then follow requirements for bare or painted metal as shown above.

  • Moderate White Rusting – noticeable darkening and apparent etching of the galvanised coating would be visible. The area should be wire brushed to fully remove all white corrosion products. A thin film of Aluminium Paint should be applied with a cloth pad to blend the affected and unaffected areas before following requirements for bare metal as shown above.

  • Severe Rusting – heavy oxide deposits are evident under which the oxidised area might be almost black with possible signs of red rust. The affected area should be wire brushed to remove all oxidation products and rust then 1 or 2 coats of a zinc rich paint should be applied to a dry film thickness of 100 microns. A suitable primer (Hammerite Special Metals Primer) would then be required before application of DTG.

UNPAINTED ALUMINIUM/NON FERROUS METAL SURFACES

  • To ensure maximum adhesion on aluminium and non ferrous metal surfaces use Hammerite

Special Metals Primer. Notes:

  • In many areas, industrial and coastal districts in particular, soluble salts may contaminate the substrate. It is essential to scrub and rinse repeatedly with clean water to remove this contamination.

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Technical Data Sheet Page 3

Issue date November 2007

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