521 Marine Epoxy Resin bonds with fiberglass, metals, wood, and composite fabrics and features superb strength, durability, and moisture resistance. ProMarine 521 Marine Epoxy cures to a high-strength solid, suitable for laminating, bonding, fairing, coating, and reinforcing. Self-leveling properties are ideal for coating and laminating. Viscosity is favored for wetting out fiberglass cloth and other reinforcement fabrics easily. Use this versatile marine epoxy resin with 521 fast or slow hardener to complete a number of boat building, repair, and restoration projects.

• Bonds with fiberglass, reinforcement fabrics, wood, etched aluminum, and bare steel and lead
• Makes a strong filleting or fairing compound or adhesive 
• Excellent thin-film characteristics provide smooth flow-out and self-leveling ideal for coating and laminating
• Easy to measure and mix using pre-calibrated 5:1 Epoxy Pumps (included), or by volume
• Easy to apply by brush, roller, syringe, spreader, or by pouring onto wood, fiberglass, reinforcement fabrics, etched aluminum, bare steel, and lead.
• Kit comes with resin, hardener, pumps, and pump calibration instructions.
• 521 Marine Epoxy Resin can be used with our 521 Fast or Slow Hardener, depending upon your application.

DIY Marine Grade Epoxy Resin Saves Money & Time

Over time, boats get “dings and dents” from use. Everyday wear-and-tear takes its toll, and boats require a bit of TLC in the form of some maintenance and repair. Marine Grade Epoxy Resin, and learning how to properly use it, can save a boat owner a great amount of time and money - taking a potentially costly endeavor – and making it into an easy and efficient task.

Why Marine Grade Epoxy Resin for Boat Repairs?

Marine vessels are frequently built using polyester resins, however when the time comes to address hull and decking maintenance and repair issues, the better solution is boat epoxy resin. 2-part marine epoxy is a stronger bonding material than polyester and most other adhesives, while at the same time boasting superior moisture, impact and corrosion resistance. Marine epoxy resin also features minimal material shrinkage - unlike polyester resin which shrinks during the curing process causing potential stress points in the substrate.

Marine-grade Epoxy Resin differs from other resins in several ways:

• Viscosity - self-leveling thin-film formula designed for coating, laminating and reinforcing - as well as wetting out fiberglass cloth and other reinforcing fabrics surfaces (not designed for clear-coating applications as tabletop, art & casting resins are)

• Bonding & Curing - like other epoxy resins, marine epoxy cures to a high-performance plastic solid that bonds to wood, metals, fiberglass and composite materials that features high strength, as well as superior impact, corrosion and water/moisture resistance; however, boat epoxy resin is not designed for clear-coating applications

• Finish – cures to a light amber solid that may be sanded, shaped and painted

• Hardener Options – marine grade epoxy resins feature two hardener options:

  • Fast Hardener – for quick repairs in cooler temperatures of 60-70 degrees F, with a working time (pot life) of 12 minutes
  • Slow Hardener – for applications requiring more working time and performed in warmer temperatures of 80 degrees F and above, with working time (pot life) of 30 minutes