Dulux Trade One coat White Matt Metal Acrylic primer 1L. Dulux Trade Metalshield Acrylic Primer in white delivers up to 8 years of metal protection. It has been formulated to seal & protect non-ferrous metal surfaces both inside & out & has excellent adhesion. We recommend using either a brush roller or spray to apply this primer followed by 2 coats of Dulux Trade Metalshield gloss or satin. Coverage of up to 18 m A² on average.