J-B Weld 8265S Original Cold-Weld Steel Reinforced Epoxy Review (2026)
By The DIYPicks Team · Updated July 2026
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- Metal
- Repairs
- Automotive
- Plumbing
- Gap filling
- High heat
A slow-curing but extremely strong steel-reinforced epoxy that is the standard for permanent metal and hard-material repairs.
Pros
- Very high cured tensile strength (about 5,020 PSI) that rivals a mechanical weld for many repairs
- Withstands up to about 550F and resists water, chemicals, and petroleum once cured
- Cured epoxy can be drilled, tapped, sanded, and painted like metal for permanent fixes
Cons
- Long 4-6 hour set time means repairs must be held or clamped for hours, not minutes
- Requires careful 1:1 hand mixing, and a bad ratio weakens the bond
- Not ideal for flexible parts or very thin joints, and it will not bond most plastics well
Specifications
| Type | Two-part epoxy (steel-reinforced) |
|---|---|
| Cure | Sets ~4-6 hrs, full cure ~15-24 hrs |
| Waterproof | Yes (once fully cured) |
| Paintable | Yes (sand, drill, tap, mold) |
| Use | Interior/exterior |
| Cleanup | Wipe with acetone before cure |