Best Glue for Metals 2026: 10 Adhesives for Steel, Aluminum, and Cast Iron
Last updated: 2026-08-20 · By NicheHive Editorial
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Our Top Picks
- #1J-B Weld Original Cold Weld Steel Reinforced Epoxy
- #2Loctite EA E-120HP Epoxy
- #3Gorilla Super Glue Gel
- #4Permatex 84109 PermaPoxy 4 Minute Multi-Metal Epoxy
- #5PC-7 Heavy Duty Paste Epoxy
- #6Loctite Metal and Concrete Epoxy
- #73M DP100 Scotch-Weld Clear Epoxy
- #8Elmer's ProBond Advanced Multi-Surface Adhesive
- #9J-B Weld 8281 Plastic Bonder Structural Adhesive
- #10DAP 7079810712 Metalfix All-Purpose Repair Compound
J-B Weld Original Cold Weld Steel Reinforced Epoxy
J-B Weld
- ✓2-part steel reinforced epoxy
- ✓5,020 PSI tensile strength
- ✓Fills gaps and cracks
- ✓Temperature resistant to 550F
Pros
- 5,020 PSI tensile strength - stronger than most metals you would repair with it
- Fills gaps - works on cracks in cast iron, cracked bolt holes, and irregular metal surfaces
- Temperature resistant to 550F - automotive use near exhaust
- Cures hard as metal - can be drilled, tapped, sanded, and painted
- J-B Weld is the most proven metal adhesive in market with decades of automotive use
Cons
- Gray color when cured - not clear
- 6-hour cure before handling, 15-24 hours for full strength
Best metal adhesive overall. J-B Weld Original is the standard for metal repair in automotive, industrial, and home repair. 5,020 PSI, gap filling, and temperature resistance make it the most capable metal adhesive available.
Loctite EA E-120HP Epoxy
Loctite
- ✓High temperature resistant to 300F
- ✓Industrial grade
- ✓Chemical resistant
Pros
- Industrial Loctite formulation for sustained high-temperature metal bonding
- Chemical resistance to oils, fuels, and solvents - automotive and industrial applications
- Higher bond strength on aluminum than standard epoxies
Cons
- Higher price than J-B Weld
- Longer cure time at room temperature
Best industrial metal epoxy. For aluminum bonding and chemical-resistant applications where J-B Weld is not the OEM specification.
Gorilla Super Glue Gel
Gorilla
- ✓Cyanoacrylate gel
- ✓45-second cure
- ✓No mixing
Pros
- 45-second cure for handling - no waiting
- Works on tight-fitting metal joints where mixing epoxy is impractical
- Single-component - convenient for quick repairs
Cons
- Lower shear strength than epoxy on metal - not for load-bearing joints
- Brittle cure - will crack under shock or vibration
Best quick metal adhesive. Cyanoacrylate for non-structural metal repairs where speed matters and loads are low.
Permatex 84109 PermaPoxy 4 Minute Multi-Metal Epoxy
Permatex
- ✓4-minute setting
- ✓Metal-specific epoxy
- ✓High strength
Pros
- 4-minute set time - handling strength in 4 minutes vs J-B Weld's 4-6 hours
- Permatex automotive pedigree - standard in automotive metal repair
- Multi-metal - steel, aluminum, copper, bronze
Cons
- Lower final strength than J-B Weld Original (4,000 PSI vs 5,020 PSI)
- Faster set reduces working time for complex joints
Best fast-cure metal epoxy. For repairs requiring handling strength within 4 minutes rather than overnight cure.
PC-7 Heavy Duty Paste Epoxy
PC Products
- ✓Heavy-duty paste
- ✓Gap filling
- ✓Bonds metal to metal and metal to concrete
Pros
- Thicker paste consistency fills large gaps - better than J-B Weld for cracks over 1/4 inch wide
- Bonds metal to concrete - unique capability for anchor bolts and rebar
- Higher filler content for structural void filling
Cons
- Slower cure than J-B Weld
- Not as temperature resistant
Best metal gap-filling adhesive. For large voids, cracks, and metal-to-concrete bonding where J-B Weld paste would not fill the gap.
Loctite Metal and Concrete Epoxy
Loctite
- ✓Metal and concrete compatible
- ✓Water resistant
- ✓Gap filling
Pros
- Bonds metal to concrete in a single product
- Water resistant for outdoor metal repairs
Cons
- Lower maximum temperature than J-B Weld
Best for metal-to-concrete bonding. For anchor plates, brackets, and metal fittings attached to concrete.
3M DP100 Scotch-Weld Clear Epoxy
3M
- ✓Clear cure
- ✓3M industrial grade
- ✓High strength
Pros
- Cures clear - for metal with visible surfaces where gray J-B Weld is unacceptable
- 3M industrial standard - professional bonding quality
Cons
- Significantly more expensive than J-B Weld
- Requires 3M dispensing gun for dual cartridge
Best clear metal epoxy. For polished metal, jewelry repair, and metal bonding where the gray cure of J-B Weld is cosmetically unacceptable.
Elmer's ProBond Advanced Multi-Surface Adhesive
Elmer's
- ✓Multi-surface including metal
- ✓Paintable
- ✓Waterproof
Pros
- Single component - no mixing
- Paintable after cure
- Bonds metal to non-metal surfaces
Cons
- Not a structural metal adhesive - for light-duty tasks
Best light-duty metal adhesive. For metal trim, decorative hardware, and non-load-bearing metal bonds.
J-B Weld 8281 Plastic Bonder Structural Adhesive
J-B Weld
- ✓Bonds metal to plastic
- ✓Flexible
- ✓J-B Weld quality
Pros
- Flexible epoxy bonds metal to plastic without stress cracking the joint
- J-B Weld product quality
Cons
- Not for metal-to-metal structural joints
Best metal-to-plastic adhesive. For brackets, housings, and components combining metal and plastic where standard rigid epoxy cracks under flex.
DAP 7079810712 Metalfix All-Purpose Repair Compound
DAP
- ✓Budget metal repair
- ✓Hardware store accessible
Pros
- Hardware store accessible at $7
- DAP brand reliability
Cons
- Significantly lower strength than J-B Weld
- Limited temperature resistance
Budget metal repair compound. For non-structural metal filling and cosmetic repairs where strength is not the priority.
Metal bonding requirements vary significantly: a cracked cast iron manifold requires temperature resistance that decorative aluminum does not. Choose adhesive based on the specific application rather than buying a general-purpose option.
When to Use Adhesive vs Welding
Adhesive is appropriate for:
- Non-structural repairs and fills
- Dissimilar metal bonding (aluminum to steel) where welding is not possible
- Electrical components where heat from welding would cause damage
- Field repairs without welding equipment
Welding is required for:
- Structural components under dynamic load (suspension, frames)
- High-temperature sustained contact above 550F
- Pressure-containing vessels and pipes
J-B Weld 5,020 PSI approaches mild steel's 50,000 PSI yield strength only for shear loads - do not use any adhesive as a substitute for structural welding on load-bearing components.
Surface Preparation
Metal adhesion depends almost entirely on surface preparation:
- Remove all rust, paint, oil, and grease
- Scuff with 80-grit sandpaper to create surface profile
- Clean with acetone or isopropyl alcohol immediately before bonding
- Apply adhesive within 5 minutes of cleaning - oxidation begins immediately
Shiny bare metal without surface profile produces weaker bonds than properly abraded surfaces. The extra 5 minutes of preparation is responsible for 50% of bond strength.
Related Guides
- Best Glue for Plastic on Plastic - rigid plastic bonding
- Best Waterproof Adhesive for Plastic - outdoor-resistant bonding
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