U-POL® FIBRAL LITE UP0700 Lite Fiber Glass Filler, 3 L Tin, Yellow, Fibrous/PasteFibral Lite Fiberglass Filler takes the place of both short and long strand products. Its lightweight formula can be easily shaped and sanded once cured. Features Spreads like a short strand yet bridges holes like a long strand Non sagging even on vertical surfaces spreads, adheres and finishes like a polyester filler Forms a hard, durable surface that is still smooth and very easy to sand Waterproof Can be finished with putty or glaze or directly