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Product Details

West System G/Flex liquid epoxy is a toughened, versatile adhesive designed for permanent, waterproof bonds on fiberglass, ceramics, glass, masonry, 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.

Liquid G/Flex 650 is a two-part (resin and hardener) mixed at a 1:1 ratio. Choose from 4 different sizes of resin/hardener: 8 oz. kit, 32 oz. kit, 2 gallon kit, 4.75 gallon resin only, and 4.75 gallon hardener only.

Info & Guides

Technical Information

G/Flex 650 Features

  • Simple 1:1 mix ratio makes G Flex easy to use
  • 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.

<b>Kit Contents</b>

  • WSY-650-8: 8 oz. of mixed epoxy (one 4 oz. resin and one 4 oz. hardener) in a plastic bag.
  • WSY-650-32: 32 oz. of mixed epoxy (one 16 oz. bottle of resin and one 16 oz. bottle of hardener)
  • WSY-650-2G: 2 gallons of mixed epoxy (one gallon of resin and one gallon of hardener)
  • WSY-650-CR: 4.75 gallons of RESIN ONLY
  • WSY-650-CR: 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 650 Liquid Epoxy

10 of 61 Reviews

July 14, 2021

repaired canoe
By jd from Roanoke, VA

Verified Purchase

this stuff worked perfect to repair old BlueHole canoe

Bottom Line Yes, I would recommend to a friend

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April 11, 2021

Great Product!
By thedad from Myrtle Beach, SC

Verified Purchase

I have started building a few one-man boast and decided to try this adhesive. It far and above exceeded my expectation. Very easy to use with fantastic results.

Bottom Line Yes, I would recommend to a friend

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April 11, 2021

I will buy this product again
By Axe Reclaimer from Connecticut

Verified Purchase

I like the long working time; much longer than everything I've used before yet total cure time is still 24 hrs. .

Bottom Line Yes, I would recommend to a friend

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April 4, 2021

Easy to use and strong
By Steveo from Hanover nh

Verified Purchase

High quality epoxy

Bottom Line Yes, I would recommend to a friend

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January 12, 2021

Used to fix snowboard
By Kate from NH

Verified Purchase

This product is working great so far, used it to fix a snowboard with splitting layers due to edge damage. Followed the directions and clamped the damaged area overnight. I've ridden it about 6 times since the fix and it's still holding, very flexible material.

Bottom Line Yes, I would recommend to a friend

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April 7, 2020

worked like a charm !
By team pellet blaster from New York

Verified Purchase

used product to bond a steel piston to a carbon fiber tube. the piston assembly is for a HW97K spring airgun. We went through this whole rifle for a complete blueprint tune. The bond is holding up now at over 1200 shots and works perfect. I do not think anything else but G/Flex would hold up to this kind of force for thousands of cycles. Best epoxy we have ever used!. I give it 10 stars!!!!!

Bottom Line Yes, I would recommend to a friend

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April 5, 2020

Great product
By Alonzo Twitch from Portland

Verified Purchase

I make knives and I used it for the handles. I also used it to bond other metal to wood projects. The longer cure time is more than made up with ease of use and quality of bond. Will continue to use it.

Bottom Line Yes, I would recommend to a friend

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April 30, 2019

Great glue
By Don from Wilmington, NC

Verified Purchase

I have an inflatable kayak that had three holes. One was on a seam. I used the epoxy glue to put on a patch and on the the seam I just used the glue and no patch. I took the kayak out a couple of days later and had not leaks.

Bottom Line Yes, I would recommend to a friend

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April 25, 2019

Gougeon Bros. West Systems Products
By Timbo W. from Bay City, MI

Verified Purchase

Meade and Jan Gougeon were friends of mine, and excellent boat designers. Their West Systems products are the finest in the world. They worked directly with some of the finest chemist's in the world at Dow Chemical to formulate West Systems Epoxies. We use the West System G/Flex 650 for the structural aspect of our racing r/c boats. The physical properties of this product are far superior to competitor's products... it's all about the modulus of elasticity- it's more stress absorbent. Of note, for small projects such as ours, we mix by weight rather than use the mini pumps to meter the components out.

Bottom Line Yes, I would recommend to a friend

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April 22, 2019

Always use G-Flex for rudder repairs
By MRP Refits from Annapolis, Md and Tortola, BVI

Verified Purchase

We have been using G-Flex epoxy to bind the rudder posts to the fiberglass skins when building or rebuilding rudders. It has eliminated the problem of leakage around a metal post to a fiberglass skin. Also, in fast turnaround damage repairs, it ensures bonding between a damp rudder skin and the underlying foam core. This ability has saved many a charter crew from cancelling charters. Superlative product.

Bottom Line Yes, I would recommend to a friend

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