Yes, galvanised steel can be painted or powder coated to provide additional colour or decorative finish, but surface preparation is critical. Fresh hot-dip galvanising has a smooth, slightly oily surface that must be prepared before painting. For brush or roller-applied paints, the surface should be cleaned, degreased and treated with an etch primer or T-wash (dilute phosphoric acid solution) to promote adhesion. For powder coating, mechanical abrasion or chemical pre-treatment is required. Using a paint or powder coat directly on an unprepared galvanised surface is a common cause of adhesion failure — always follow the paint manufacturer’s surface preparation specification for galvanised substrates.
