Strengths
What it’s good at
Hand-kneadable, non-rusting steel-reinforced epoxy putty for emergency plumbing repairs, auto components, stripped metal threads, and rebuilding missing metal/machinery sections — sets in 5 minutes and fully cures in 1 hour with 4,000 psi tensile strength.
Limits
Where it falls short
Not for flexible rubber, soft plastics (polyethylene, polypropylene), or applications requiring transparent glue lines (cures dark gray).
Specifications
Manufacturer specifications
Every number below is quoted from the manufacturer’s own documentation, linked at the end of the row.
- Working time
- 5 min — Hand-knead working life and set time 3–5 min[1]
- Full cure
- 1 h — Reaches functional full cure in 1 h (drillable, tapable, and sandable)[1]
- Strength
- 4000 psi — Tensile strength of 4,000 psi[1]
- Max service temperature
- 350 °F — Withstands continuous temperatures up to 350 °F (intermittent to 450 °F)[1]
- Cured color
- Dark gray[1]
- Water resistance
- 100 % waterproof, petroleum and hydraulic fluid resistant, non-rusting[1]
- Paintable
- Yes — fully machinable, drillable, and paintable once cured[1]
How long it takes
Working time, clamp time, and full cure are different things — this is the order you experience them in.
- Working time5 min
- Full cure1 h
Sources
Where these facts come from
- [1]J-B Weld SteelStik Steel Reinforced Epoxy Putty Technical Data Sheet — J-B Weld Company · Technical data sheet · Retrieved 2026-08-14
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