A pre-treatment for galvanised steel to ensure the subsequent adhesion of a wide range of coatings. A colour change from grey to black is visual proof that the entire surface has been satisfactorily treated.
Mordant/T-Wash is often replaced by modern single pack adhesion promoting primers, or all-in-one primer and finishes. These modern coatings remove the labour and material costs of the traditional acid-based mordant pre-treatment stage.
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