Will JB Weld Work on Exhaust Pipe?
Yes, JB Weld can work on an exhaust pipe—but with some important conditions. The extreme heat and vibration from an exhaust system present unique challenges, so using the right product and technique is key to success.
JB Weld and High Heat: What You Need to Know
Standard JB Weld products are not designed for high-heat environments. However, JB Weld does offer a product specifically made for exhaust repairs:
Recommended Product: JB Weld ExtremeHeat
- Heat resistant up to 2400°F (1300°C)
- Designed for exhaust manifolds, pipes, mufflers, and catalytic converters
- Cures with heat over time
- No mixing required (it’s a single-component paste)
How to Use JB Weld on Exhaust Pipes
- Clean the Area
- Remove all dirt, rust, and grease. Use a wire brush or sandpaper for a rough surface.
- Wipe with alcohol or acetone.
- Apply JB Weld ExtremeHeat
- Spread a generous amount over the crack or hole.
- Smooth it out using a putty knife or your finger (with gloves on).
- Cure with Heat
- Let the paste dry for 30 minutes at room temp.
- Then run the engine to allow exhaust heat to cure it fully over several heat cycles.
What It Can Fix
- Cracks or small holes in exhaust pipes
- Weld seams with minor leaks
- Temporary fix for muffler patches
What It Won’t Fix
- Large holes or completely rotted sections
- Flexible joints or flex pipes
- Anything requiring a load-bearing or structural repair
FAQs
Q: Will regular JB Weld work on an exhaust pipe?
A: Not effectively. It breaks down under high heat. Use JB Weld ExtremeHeat.
Q: Is this a permanent fix?
A: It’s more of a strong temporary fix. For best results, follow up with welding or part replacement.
Q: Can I use it without removing the exhaust?
A: Yes, if you can access the damaged area and clean it well.
Conclusion
JB Weld ExtremeHeat can be a lifesaver for emergency exhaust repairs. While it’s not a substitute for welding, it can seal up cracks and holes well enough to get you back on the road. Always prioritize safety and check with a mechanic if the damage is extensive.
Need help choosing the right JB Weld product for your repair? Just let me know!
