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Product Details

G/flex Thickened Epoxy Adhesive Resin and Hardener has a thickening agent, and is a toughened, versatile epoxy for permanent waterproof bonding of fiberglass, ceramics, metals, plastics, damp and difficult-to-bond woods.

G/flex epoxy is resilient enough to bond dissimilar materials and flexible enough to absorb the stress of expansion, contraction, shock and vibration.

Choose from 4 different sizes of resin/hardener: 8 oz. kit, 2 Quart kit, 2 Gallon kit, 4.75 Gallon resin only, and 4.75 Gallon hardener only.

Info & Guides

G/flex is a tough, resilient epoxy engineered for a superior grip to metals, plastics, glass, masonry, fiberglass, and wet and difficult-to bond woods.

It is currently available in two versions: G/flex 650 Epoxy (sold separately, a two-part (resin and hardener) liquid epoxy, and G/flex 655 Thickened Epoxy Adhesive with a thickening agent already added.

G/flex is easy to use with a simple 1:1 mix ratio. It has a long open working time of 45 minutes at room temperature. G/flex reaches a working cure in 7-10 hours and a full cure in 24 hours.

Technical Information

<b>Kit Contents</b>

  • WSY-655-8: 8 oz. of mixed epoxy (one 4 oz. resin and one 4 oz. hardener).
  • WSY-655-2QT: 2 qts. of mixed epoxy (one quart of resin and one quart of hardener).
  • WSY-655-2G: 2 gallons of mixed epoxy (one gallon of resin and one gallon of hardener).
  • WSY-655-CR: 4.75 gallons of RESIN ONLY
  • WSY-655-CH: 4.75 gallons of HARDENER ONLY

Epoxy Safety

  • Avoid skin contact with resin, hardener or mixed epoxy. Wear liquid-proof gloves and adequate protective clothing to keep the epoxy off your skin.
  • Avoid eye contact with resin, hardener or mixed epoxy. Wear protective glasses. In case of contact with eyes, flush with water for 15 minutes and consult a physician.
  • Avoid inhalation of vapors. Provide adequate ventilation. Wear a dust mask when sanding epoxy, especially epoxy that has not fully cured.
  • Read and follow safety information on resin and hardener containers.
  • Reviews for WEST System G/flex 655 Thickened Epoxy Adhesive

    10 of 28 Reviews

    May 27, 2021

    I love GFlex!
    By Paul from Grand Rapids, MI

    Verified Purchase

    Impressed with its ease of use, versatility and durability. I used it to repair my aluminum boat with great results and a number of other household projects.

    Bottom Line Yes, I would recommend to a friend

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    June 11, 2020

    West System should review its packaging method for G/flex
    By Breck from Austin, Texas

    Verified Purchase

    The product works great. But the resin tube on my first order was cracked and oozing a little product out when I opened the package. I contacted Jamestown and they immediately shipped me another package with both resin and hardener. When I opened this new package, neither tube was leaking, but both had indentations like the resin tube in the original shipment - exactly in the same place (see first attached photo). I don't need another replacement, but I am going to have to be careful how I store the tubes for future use. In both shipments, there was no visible damage to the shipping box, so I suspect the damage to the tubes may have happened before the final shipments to me. In any case, I suggest West System should look into this for their future customers. One note: in both shipments, the tops of the tubes were face down in the product box. This puts the tops against each other. If they put one tube in with top up and one with top down, this would give more space between them - maybe put a piece of cardboard or thin foam between them, as it appears the damage is due to one tube pressing against the other. Also, I suggest that Jamestown open up the product box and inspect the tubes before shipping until this packaging problem gets reviewed and revised.

    Second indentation on side of tube near top - just up and to the left of the G
    Indentations just below the top rim of both tubes.
    Bottom Line Yes, I would recommend to a friend

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    August 26, 2019

    Easy to apply
    By Jj from Northern pa

    Verified Purchase

    I would probably give 5 stars but I have witnessed performance over time. I really like the thickened product which makes it easy to mix and apply and has a good working time. I repaired scratches dings and gouges in my royalex/vinyl canoe. My putty knife a over spread cleaned up well with acetone.

    Bottom Line Yes, I would recommend to a friend

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    May 28, 2019

    It does what it is to do.
    By George from PA

    Verified Purchase

    Just fine

    Bottom Line Yes, I would recommend to a friend

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    February 22, 2019

    Worked as Advertised
    By Below Grade from Louisiana

    Verified Purchase

    Purchased the 2 quart kit and used it to attach a polyethylene riser to a fiberglass septic tank. No fasteners were used and the epoxy formed a permanent waterproof bond below grade to prevent the intrusion of rain water. Well worth the expense. Do it right the first time and never look back.

    Bottom Line Yes, I would recommend to a friend

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    February 21, 2019

    Great product
    By Dk from Bend, Oregon

    Verified Purchase

    I use the product to fill cracks and voids in natural edge slabs. The wood I use is oily. I have had no issues with bonding at all. I have been using this product for about 10 years now.

    Bottom Line Yes, I would recommend to a friend

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    January 24, 2019

    G/Flex to my rescue
    By Akconnection from WI

    Verified Purchase

    I have owned a mad river royalex canoe about 30 years. At one point the gunwales were not released when I lived in Fairbanks AK. Winter hit and it resulted in 23 rather extensive cracks. G/Flex 655 was recommended to repair them and it is working wonderfully. I haven't put it back in the water yet but ots Jan in WI Highly recommend it.

    Interior buildup
    Exterior smoth finish
    Bottom Line Yes, I would recommend to a friend

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    August 30, 2017

    very good,user friendly,good working time, good set up time.
    By river rat from west central indiana

    Verified Purchase

    repaired cold cracks in older royalex canoe, thick epoxy stayed in place, set well...

    Bottom Line Yes, I would recommend to a friend

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    August 1, 2017

    actually worked as advertised on cracked royalex canoe...
    By river rat from west central indiana

    Verified Purchase

    glad i bought thickened epoxy,,i don't think the standard would have worked in my application..

    Bottom Line Yes, I would recommend to a friend

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    February 27, 2016

    Knife makers praise g/flex
    By CACCI from Staunton, IL

    Many of us who make custom knives use this almost exclusively. Bonding many dissimilar materials can be problematic, but I bond carbon fiber to wood to steel to brass to bone to vulcanized fiber to leather to plastic in any order with consistent success. My only con is high shipping on 2 four oz. bottles!!!!

    Bottom Line Yes, I would recommend to a friend

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