3M - Marine High Strength Repair Filler - 9.9 lbs - 46014. 3M Marine High Strength Repair Filler restores damaged areas of fiberglass hulls, decks and other areas on boats. Our filler is a high performance product that is reinforced with short strands of fiberglass for added strength. Boat restoration professionals commonly use this product.. A Strong Two-Part Filler for Marine Repair. 3M Marine High Strength Repair Filler is a uniquely modified vinyl ester structural filler formulated with shor