3M 7000125050 Long Strand Fiberglass Reinforced Polyester Filler

Product Description

The 3M 7000125050 is a long-strand fiberglass-reinforced polyester body filler designed for high-strength waterproof repairs on metal and fiberglass substrates. The long fiberglass strands embedded throughout the filler matrix deliver approximately twice the strength of standard body fillers, making it well suited for structural repair work where ordinary fillers would crack or delaminate. At 2.85 pounds per quart unit, it is ready to mix and apply without additional fiber additives. Body technicians, collision repair specialists, and marine repair pros use this product where a standard filler lacks the reinforcement needed for lasting results.

This filler is used in automotive body repair, marine hull patching, and general fiberglass fabrication. It can be applied directly over rusted-out metal panels or damaged fiberglass surfaces. When used in combination with fiberglass tape, cloth, or mat, it rebuilds structural sections that have deteriorated beyond what conventional fillers can address. Typical applications include repair of floor pans, rocker panels, boat hulls, and other areas subject to moisture exposure or mechanical stress.

Key Features

• Long-strand fiberglass reinforcement provides approximately twice the strength of standard polyester body fillers
• Waterproof formulation suited for repairs exposed to moisture, including marine and underbody applications
• Compatible with fiberglass tape, cloth, and mat for full structural rebuild of rusted or damaged panels
• Works on both metal and fiberglass substrates without requiring separate primers before filler application
• 1 quart unit size allows controlled use on targeted repair areas

Compatibility

Designed for use on rusted-out metal panels and damaged fiberglass materials. Can be used in conjunction with fiberglass tape, cloth, or mat for repair and rebuild applications. No specific vehicle model or system compatibility was stated in the product data.

Installation Notes

This product is typically applied by body technicians or marine repair professionals working in well-ventilated areas. Surface preparation including cleaning, sanding, and removing loose rust or delaminated material is required before application. Follow the manufacturer mixing ratio instructions for the hardener to ensure proper cure. Wear appropriate PPE including gloves and respiratory protection when mixing and sanding polyester filler materials.

Technical Specifications

• Weight: 2.85 pounds
• Container Size: 1 quart
• Reinforcement Type: Long-strand fiberglass
• Base Material: Polyester
• UPC: 00076308004729

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000125050