Arjay 4001 Polyester Core Bonding Compound – 5 GL

Arjay 4001 High Strength Core Bonding


When repairs require high tensile and flexural strength, 4001 does the trick. Easy mixing and easy application and the ability to adhere and truly bond to a wide variety of substrates.


47 in stock

Arjay 4001 Polyester Core Bonding Compound


Arjay 4001 Core Bonding Compound is the high strength bonding choice for boats, providing superior tensile strength and fantastic flexural strength. Fiberglass boat repairs require a product that has not only a strong bond, but is flexible enough to withstand high seas and Arjay’s 4001 does just that. 4001 adheres to many types of surfaces, including PVC, Foam, Balsa and Honeycomb, along with so much more.

Arjay 4001 Polyester Core Bonding Compound Benefits:

  1. Flexible Gel Times
  2. Works with nearly all types of coring
  3. Increases flexural strength by up to 60%
  4. Great for bonding large FRP Laminates
  5. Requires MEK-P Catalyst (is not included). We recommend buying our 1 Quart MEK-P and then following the mixing directions.


  1. Charlie Norris

    “I love fiberglass coatings. They have great products and excellent advice. I'm trying to open a boat repair shop in St . Mary's, GA and my supply WILL come from fiberglass coatings. When I lived in the Fl. Keys for 36 years and worked for a towing and salvage Co for 15 years all our supplies came from Fiberglass coatings. Great service and never were disappointed. Keep up the great job everyone.”
  2. Brian Lewis

    “The staff are very knowledgeable and friendly Have always gotten the right stuff for the right job. Pat,mark,Colby,Ryan your the best. Pat is the walking encyclopedia of FGCI.”
  3. Justin Lammers

    “Been working on a skiff project and using all FGCI products. They came highly recommended by my friends who are boat builders. It is the highest quality resins, glass, and gelcoat for the money. They made it really easy for a newer person to boat building. The customer service is phenomenal and they are always knowledgeable and ready to help with any questions I had.”