Epoxy Adhesives: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
They disagree: Claude chooses Loctite and GPT chooses 3M
In Industrial & Scientific, Claude and GPT choose the same brand in 52 of 107 categories.
Claude Opus 5.5 · October 28, 2026
Loctite Epoxy Five Minute (line)
It is a widely sold, predictable two-part syringe epoxy that sets fast enough for everyday repairs and bonds metal, wood, ceramic, glass and most rigid plastics.
Not for: Load-bearing structural joints, outdoor parts under constant stress, or polyethylene and polypropylene, which ordinary epoxies will not bond.
GPT 6.1 Sol · November 10, 2026
3M Scotch-Weld DP420
Toughened two-part epoxy offering high shear strength, impact resistance, and a useful working time for demanding metal and composite bonding.
Not for: Instant repairs, highly flexible joints, or bonding polyethylene and polypropylene.
Claude also picks 3M for “structural bonding with a dispense gun”.
Which one fits you
structural bonding with a dispense gun
3M Scotch-Weld DP420
It is a toughened structural epoxy in a dual cartridge with static mixing, so you get a consistent mix ratio and high, impact-resistant bond strength on metals and composites.
Not for: Occasional DIY users who do not want to buy a matching applicator gun and mixing nozzles.
flexing, wet or wood and boat joints
West System G/flex 650
It is a toughened, slightly flexible epoxy that holds up on wood, damp surfaces and materials that expand and move.
Not for: Anyone who needs handling strength within minutes.
clear bond lines on visible repairs
Devcon 5 Minute Epoxy (line)
It is a long-standing fast-setting clear epoxy suited to glass, ceramic and other repairs where the glue line will show.
Not for: Long-term outdoor UV exposure, where clear epoxies tend to yellow.
Check before you buy
Where to find Loctite Epoxy Five Minute
- TGoldkamp
- Strobels Supply
- Hisco
Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Loctite: Broad consumer range, including fast-set, plastic-bonder and marine variants.
- 3M: Scotch-Weld DP cartridges are the industrial benchmark for structural epoxies.
- J-B Weld: Best known for steel-filled repair epoxies; also sells clear fast-set types.
- Devcon: Industrial and maintenance epoxies, including metal-filled putties.
- West System: Marine and woodworking epoxies, including the flexible G/flex.
- Gorilla: Easy-to-find general-purpose clear epoxy syringes.
What to avoid
- Fast-set epoxy for structural or load-bearing joints.
- Mixing by eye from separate tubes when a static-mix syringe is available.
- Bonding unsanded, oily surfaces; degrease and abrade first.
- Using any standard epoxy on polyethylene or polypropylene.
Questions
Is epoxy stronger than super glue?
For gap filling, impact and heat, generally yes. Cyanoacrylate is faster and better for tight-fitting small parts, but it is brittle.