With the Norton T489 waterproof sanding sheet, you prepare paint, primer, and steel surfaces for an ultra-smooth finish. Featuring a fine P500 grit made from sharp silicon carbide, it keys and levels coatings evenly without leaving deep sanding marks. The flexible 230x280 mm backing effortlessly adapts to contours, curves, and edges without tearing. Whether you work dry or sand wet to prevent sheet clogging, this abrasive paper delivers consistent control and a uniform surface every time.