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UPO 700 Fibral Lite Sandable Fiberglass Filler The UPO 700 Fibral Lite Sandable Fiberglass Filler is designed to spread like short strand products and bridges holes like long strand products. This Fiberglass Filler can be easily shaped and sanded once it cures. The UPO 700 Fibral Lite Sandable Fiberglass Filler does not sag on vertical surfaces and will spread adhere and finish like polyester fillers. This Fiberglass Filler forms a hard stong surface that is smooth and easy to sand.