Bondo Glass Reinforced Filler is a unique reinforced body filler containing short, interlocking fiberglass strands and fibers that makes it stronger than regular body filler. The fiberglass in the filler eliminates the need for backing strips, fiberglass resin or cloth on small ...Bondo Glass Reinforced Filler is a unique reinforced body filler containing short, interlocking fiberglass strands and fibers that makes it stronger than regular body filler. The fiberglass in the filler eliminates the need for backing strips, fiberglass resin or cloth on small holes and rusted-out areas.
It is capable of repairing small rusted-out metal holes and shattered fiberglass body parts. It is compatible with all paint systems and also works great on boats.