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G/flex 655-8 Epoxy Adhesive


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Thickened G/flex® Epoxy Adhesive, 4.5 oz. tubes of resin and hardener. It forms a tough bond on many different materials. Waterproof, flexible, permanent.
  • You get 4.5 oz. each of thickened G/flex 655 resin and hardener. Mixing ratio is 1:1. These are the same tubes of resin and hardener that come in the G/flex 655-K Kit.
  • Mixed G/flex 655 is of a "gel-toothpaste" consistency. It's still very spreadable, but stays put where it is applied.
  • G/flex is a product of West System, a division of Gougeon Brother's, Inc. The Gougeon brothers have been using epoxy resins in boat building and repair for some 50 years.
  • It makes structural bonds that can absorb the stresses of expansion, contraction, shock and vibration.
  • In addition to its superior bonding to many different materials and its ability to bond dissimilar materials, cured G/flex is much more flexible than other epoxies. This is an excellent property for boat building and repair.
  • Polyethylene (HDPE) is a common kayak and canoe material. Its molecular structure resists gluing by most adhesives. G/flex solves the problem; it bonds well to polyethylene and ABS plastics.
  • At 72 degrees F pot life is 45 minutes. Working time is 75 minutes. It cures to a solid in three hours and cures to its full strength in one to two days. It cures faster in warmer temperatures and slower in colder ones.
  • Clean up is simple. Wipe up spills with absorbent materials. Clean residue before it cures, with alcohol or acetone.
  • G/flex adheres tenaciously to difficult-to-glue hardwoods, both tropical and domestic varieties.
  • It has the ability to glue damp woods. It can be used on wet surfaces, even underwater when applied with specific techniques.
  • G/flex does indeed belong in every boater's repair kit. The more you use it, the more uses you'll find for it - with your boating gear and other sporting and household items. It's easy to mix and use. The instructions are top notch; check them out in the More Information section on this page.

Sales on this product are final. It is non-refundable and cannot be returned to us. If you are at all uncertain whether this is the product you need, call 877.677.4327 for our expert advice.

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  • Complete handling and repair instructions
  • 4.5 ounces each of thickened G/flex® 655 resin and hardener
  • Mixing ratio of 1:1
  • Pot life: 45 minutes at 72 degrees F
  • Working time: 75 minutes at 72 degrees F
  • Cures to a solid in 3 hr. at 72 degrees F
  • Workable cure in 7-10 hr. at 72 degrees F
  • Reaches full strength in 1-2 days

video: G/flex Epoxy Kayak Challenge Video

G/flex Epoxy Kayak Challenge Video (2:55)

G/flex Epoxy Adhesive belongs in every boater's repair kit. Get a waterproof, flexible bond on plastic, fiberglass, aluminum, etc.

video: How To: Inflatable Repair Adhesives Guide

How To: Inflatable Repair Adhesives Guide (4:16)

When repairing your Hypalon, PVC or urethane inflatable, or your plastic or composite kayak, it's vital that you choose the right adhesive and solvent for the job. Using the wrong materials will result in a poor repair and wasted effort. In this video, Josh from NRS Repairs shares an inflatable repair adhesives guide to help you understand when to use such glues as Clifton Hypalon, Shore, Stabond, Clifton Urethane, Vynabond and G/flex Epoxy. Solvents for repair prep are important too; you'll also learn when you can use toluene, MEK, acetone and alcohol.


by PowerReviews
GFlexG/flex 655-8 Epoxy Adhesive

(based on 2 reviews)

Ratings Distribution

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Reviewed by 2 customers

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Works as Advertised!

By OkKayakkid

from Cincinnati OH

Verified Buyer

Comments about G/flex 655-8 Epoxy Adhesive:

Product worked great. Long work time was unexpected. Didn't have to rush like when I'm using fiberglass.

  • Was this a gift?:
  • No

(2 of 2 customers found this review helpful)


So far so good

By Jason

from Eagle, Colorado

Verified Buyer


  • Easy to Use
  • Works Well


  • Stinky Use With Vent

Best Uses

  • Kayak repair
  • Paddle repair
  • Probably Lots Of Stuff

Comments about G/flex 655-8 Epoxy Adhesive:

Bought it to repair a hole in my kayak, a bolt pulled through. Took Kayak apart, used torch to heat and bend the plastic back as much as I could(be careful not to overheat). Put a stick the same size as the bolt hole in the hole. Backed the hole with a thin piece of metal, don't know if I needed to, I don't like to fix things twice. Used the epoxy in the cracks and cuts, under and over the metal, waited 12 hours, pulled out the stick(which I covered in plastic so I wouldn't have to work hard to get it back out). Works great, flexible and strong. Took a chance to fill in some deep lines on the bottom of the Kayak, those seem to be holding perfectly. Lost my paddle, got it back with some damage, rubbed areas, lost about 1/4 inch of material in one place. Prepped, put the epoxy on it, looks great, holding very well. Use the torch to burn off oxygenated plastic and heat the area before application(as according to instructions). Use it in a well ventilated area, it's an impressive smell. It's exactly what I wanted it to be. Worth it by far compared to paying someone else to repair it.

  • Was this a gift?:
  • No

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2 Questions | 3 Answers
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  • G/flex 655-8 Epoxy Adhesive


    can this producet be utalized with a type of fiberglass cloth to overlay a crack in abs material to increase the strengh and help to prevent the crack from re-opening or is the epoxy itself spread beyond the crack area to thicken the repair area. tks. in advance for your reply.
    Asked on 1/12/2017 by Daniel from Canada

    2 answers

    • A:

      This epoxy alone is all you need. I have never seen anything like this stuff before. I just finished patching an Old Town canoe, damaged by a 100 feet tall pine tree that fell directly on top. Patched the cracks and been enjoying the canoe since!!

      Answered on 1/12/2017 by daryl from undisclosed
    • Staff Reviewer


      Daniel, for working with fiberglass cloth I recommend the more liquid 650 material - http://www.nrs.com/product/2270/gflex-650-8-epoxy-adhesive - There on the product page, under More Information, there are links to the use instructions and more info. Give a call if you have more questions, 800.635.5202.

      Answered on 1/14/2017 by Clyde from NRS
  • G/flex 655-8 Epoxy Adhesive


    Will the gflex adhesive work to glue vinyl to fiberglass?
    Asked on 1/2/2015 by Steve from Wenatchee, WA

    1 answer

    • Staff Reviewer


      Yes, Steve. Look at the instructions linked in the More Information section on the product page for techniques.

      Answered on 1/2/2015 by Clyde from NRS
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