This performance body filler can be used alone or in conjunction with fiberglass tape, cloth, or mat, to repair and rebuild rusted-out metal or damaged fiberglass materials.
Long Strand Reinforced Filler is reinforced with long-strand fiberglass to create especially flexible repairs that are even stronger than those made with short strand body fillers, and far stronger than conventional fillers..
There's a trade-off, however, in that those long strands make this filler stringy and more difficult to work with.
We recommend leaving this filler with a slightly concave surface, and overlaying a glazing putty skimcoat which will be easier to shape and sand to a smooth finish for above the waterline cosmetics.
For a smooth sanded surface below the waterline, use 3M Marine Premium Filler which is made with waterproof vinylester resin.
• Ideal for larger repairs, and for filling flexing gaps
• Longest lasting filler repairs
• Repairs dents and other surface incongruities in metal, fiberglass, and wood
• Waterproof when properly primed or topcoated