Fibreglass Evercoat 416 Metal Glaze Polyester Finishing and Blending Putty - 30 Oz. Pump METALWORKS products contain ZNX-7 for superior adhesion and feather-edging to corrosion treated metals, including hot dipped galvanized steel. This preserves the corrosion protection and can honor the OEM corrosion warranty Extra-thin formula is ideal for blending with other METALWORKS products to enhance the spread and sandability without sacrificing any premium features or integrity Spreads to an ultra-smooth finish with a fine taper, easily filling pinholes, grind marks, low spots and other minor imperfections Tack-free formula for easy sanding without clogging sandpaper Easily sands to a fine feather-edge producing a pinhole-free finish