MTN WEPRO Fiberglass Filler 250g is a styrene-free, two-component polyester filler reinforced with 3 mm glass fibers. It is designed for repairing damaged surfaces, filling holes, and building up areas where material is missing. The glass fibers provide high mechanical strength, making the filler suitable for structural repairs on materials such as steel, iron, and fiberglass. Its high thixotropy allows for easy application on both horizontal and vertical surfaces without sagging. BPO hardener is included.