MPD Muffler Cement Putty 16 oz – Exhaust Leak Repair Putty, Heat Resistant to 2000°F

MPD Muffler Cement Putty is a heavy-duty, high-temperature repair compound that seals exhaust leaks, cracks and holes in mufflers, tailpipes and other automotive exhaust components.

If you need a fast, permanent-feeling fix for an exhaust leak without removing parts or welding, this 16 oz putty offers a workable paste that cures to a heat-tolerant seal. Formulated to resist temperatures up to 2000°F, the compound bonds to metal and other exhaust surfaces so you can restore performance, reduce noise and stop fumes from escaping while you prepare for a more permanent repair.

How does MPD Muffler Cement Putty stop exhaust leaks quickly?

The putty is a malleable paste that molds into gaps and holes, filling voids to create a continuous repair surface. It adheres to common exhaust metals and sets into a firm, high-temperature-resistant seal so leaks are contained almost immediately after application.

• Ready-to-use 16 oz tub for medium repairs
• Works on mufflers, tailpipes, joints and welded seams
• Adheres to steel, aluminized metal and similar exhaust substrates
• Fills cracks, pinholes and larger perforations up to recommended depth

What temperatures and conditions can the putty withstand?

MPD Muffler Cement is formulated for extreme heat exposure and performs reliably in exhaust environments where temperatures spike. Its thermal resistance rating up to 2000°F helps maintain the repair under continuous high-heat cycling found in engines and exhaust systems.

• Rated heat resistance: up to 2000°F for exhaust applications
• Resistant to hot gases and thermal expansion/contraction
• Maintains bond under vibration typical of automotive use
• Suitable for both under-vehicle and near-engine exhaust sections

How do you apply the putty for best results?

Surface prep and correct shaping ensure the longest-lasting fix. Clean and roughen the repair area, knead the putty until uniform, press it into the defect and smooth the surface to form a continuous seal; curing begins as it sets to operating temperature.

• Clean area of oil, rust flakes and loose scale before applying
• Knead to a uniform color, then press into holes and seams
• Smooth edges to create continuous coverage and prevent gaps
• Allow initial set, then run engine to complete heat cure as directed

How long will a repair last and when should I seek professional service?

Repairs made with this putty are robust for permanent or long-term temporary fixes depending on damage severity and installation quality. For widely corroded panels, extensive structural damage, or when emissions compliance is required, follow up with professional welding or component replacement.

• Durability depends on damage size, prep and placement
• Good for many common pinholes, small cracks and seam leaks
• Consider replacement for heavily rusted or load-bearing sections
• Use as an effective stopgap until a full repair is done if needed

Who is this for: MPD Muffler Cement Putty is designed for DIY mechanics, fleet maintenance crews, and automotive technicians who need a high-temperature repair compound for exhaust leaks without immediate welding. It suits weekenders fixing muffler pinholes, professional shops performing quick turnaround repairs, and anyone who needs a dependable, heat-resistant seal to restore exhaust function and reduce noise while evaluating long-term service options.