3M Company 420 Fiberglass Repair Kit

Product Description

The 3M COMPANY 420 is a fiberglass repair kit designed for patching and reinforcing fiberglass surfaces in trade and maintenance applications. The kit includes woven fiberglass cloth, a 1/2 pint resin, a hardener, a mixing tray, and a spreader, giving technicians and maintenance professionals everything needed to complete a structural fiberglass repair in a single package. The resin-and-hardener two-part system cures to a hard, durable finish suitable for restoring load-bearing or weather-exposed fiberglass components. Weighing 6 pounds per unit, each kit is sold individually.

This kit is appropriate for residential and light commercial maintenance work involving fiberglass panels, ducts, housings, or enclosures that have developed cracks, holes, or delamination. It is commonly used by HVAC technicians, plumbers, pool service professionals, and general maintenance contractors when fiberglass substrates require field repair without full component replacement. The included spreader and mixing tray support proper resin mixing and application in the field.

Key Features

• Complete single-package kit with cloth, 1/2 pint resin, hardener, mixing tray, and spreader
• Two-part resin and hardener system cures to a hard, structural finish
• Woven fiberglass cloth provides reinforcement for crack and hole repairs
• Mixing tray and spreader included for field use without additional tools
• Sold as individual units with a package quantity of 6 available

Compatibility

Designed for use on fiberglass surfaces as an OEM-style field repair solution for panels, housings, ducts, and enclosures made from fiberglass-reinforced polyester or similar composite materials.

Installation Notes

This repair kit should be applied by a qualified technician familiar with two-part resin systems. Surface preparation is critical — clean, dry, and abrade the damaged area before applying cloth and resin. Follow all manufacturer mixing ratio instructions for the resin and hardener to ensure proper cure. Work in a well-ventilated area and use appropriate PPE including gloves and eye protection when handling resin and hardener components.

Technical Specifications

• Kit Contents: Fiberglass cloth, 1/2 pint resin, hardener, mixing tray, spreader
• Weight: 6 pounds
• Unit of Measure: Each
• Package Quantity: 6

Standard Information

• Brand: 3M COMPANY
• Manufacturer Part Number: 420