How to rustproof a muffler

This blog post will answer the question, “How to rustproof muffler and covers topics like a few ways to keep muffler from rusting, muffler’s rust prevention technique, and frequently asked questions.

How to rustproof a muffler?

The muffler can be made rustproof by following the steps given below: 

  • Spray the bottom of your vehicle on a regular basis.
  • Choose an exhaust system of excellent quality. 
  • Purchase an undercoat.
  • Remember to wax. 
  • Go for at least 30 min of driving. 

Water attacks your exhaust system from both the inside and the exterior, speeding up the corrosion activity and perhaps causing irreversible damage. Muck, dust, gravel, and other typical sorts of debris that are flung up onto the underside of your automobile as you drive down a road retain the water.

Spray the bottom of your vehicle on a regular basis:

One of the simplest ways to avoid rust on your underside is to spray down the bottom of your car, particularly your muffler. Washing your exhaust system on a constant schedule will go a long way toward avoiding corrosion from developing since it eliminates the majority of the grit, sand, and other material that promote rust. These roadway materials tend to retain humidity in your muffler system’s metal, allowing corrosion to grow.

Material Needed
Spray for the bottom of the vehicle

Choose an exhaust system of excellent quality:

Metal mufflers are the most common, while stainless steel mufflers are the finest. Stainless steel is not completely corrosion-resistant, but it resists rotting significantly better than other metals used in exhaust systems. However, high-end stainless steel exhaust systems are sometimes extremely costly, costing 3–4 times as much as low-cost exhausts.

Purchase an undercoat: 

While there are conflicting reports on this one, applying an undercoat to your exhaust pipe is another approach to keep it from corrosion. An undercoat provides an additional layer of security between the steel and the environment, rendering corrosion more difficult to establish. 

Some swear by its efficiency, while others complain that it wears off rapidly or emits a bad odor when driving.Painting is an alternative to undercoating. Some customers believe that having their exhaust manifolds properly painted has been quite helpful in stopping corrosion from accumulating. 

If you plan to use this procedure, talk to your technician about proper upkeep and the high-temperature metal coatings that are available to ensure that the layer lasts as long as necessary.

Here’s a highly recommended undercoating spray:

Rust-Oleum 248656 Professional Grade Rubberized Undercoating Spray, 15 oz, Black

Benefits of Rust-Oleum 248656 Professional Grade Rubberized Undercoating Spray:

  • Use on raw or prepared metal underbodies of automobiles, tractors, vans, RVs, and other vehicles.
  • An expert solution protects from rust and other chemical damages caused by water, salts, and other substances.

Remember to wax: 

Waxing is another corrosion-prevention practice that, when used on a routine basis, can be helpful. Humidity, salt, dirt, and other rust-causing elements will not adhere to your exhaust pipe with a wax layer. It has a short lifespan.

Go for at least 30 minutes of driving: 

The dampness that gets caught within mufflers causes them to corrode from the inside out, which is one of the chief causes they start to corrode. If you simply drive your automobile for a short range, the humidity inside the muffler will never entirely dry. When you drive the automobile for extended periods of time, the exhaust warms up more, giving you a higher opportunity of cleaning the water from the muffler.

Muffler Rust Prevention Techniques:

The muffler on your vehicle is among the most vulnerable components. It’s close to the floor, therefore it’s prone to being wet, muddy, and dirty. If corrosion develops and is not addressed, it will erode the metal of the muffler, necessitating the replacement of the whole exhaust system, which can be costly based on the car. Muffler and exhaust corrosion can be avoided with a little preventative maintenance.

What are the causes of rust on mufflers?

Rust is mainly caused by humidity and salt.

How does humidity cause rust on mufflers?

Rust develops on a vehicle muffler when humidity is retained on the metallic surface by sludge and grime, or when humidity is permitted to sit on top of the metal, gradually corroding it. 

How does salt cause rust on mufflers?

Salt is frequently used on roadways in regions with chilly, cold weather to battle icy roads. Corrosion takes place if salt seeps into a vehicle’s exhaust pipe. 

Stainless steel, which is more corrosion resistant than normal steel, is used in many exhausts, notably aftermarket performance exhausts. Even stainless steel, though, can corrode over time.

Few techniques for removing rust are described below:

  • The Muffler Should Be Cleaned and Maintained
  • The muffler should be painted
  • Coating with powder
  • Plating in chrome
  • WD-40
  • Keep an eye on things
  • Coat the Exhaust’s External Surface

Now I will elaborate on the guidance given above:

The Muffler Should Be Cleaned and Maintained:

Cleaning the exhaust with a detergent or mild cleanser on a routine basis is one technique to prevent corrosion. Here’s how you can do it:

  • Raise the back of the vehicle to grant access to the muffler. 
  • Using a sprayer and water, wash away all dust. If the cleaner is in a squeeze bottle, spritz it on the exhaust, or clean it with a rag dipped in a bowl of water. 
  • Make that the muffler welds and any exhaust fittings that keep the exhaust together are tidy. 
  • Dry it completely with a cleaned, dry cloth once it’s tidy. 
  • Do this as regularly as possible to keep your exhaust pipe corrosion-free.
Materials NeededTools Needed
Detergent or cleanserSprayer

The muffler should be painted:

Another approach to keep your muffler and exhaust from rusting is to spray paint them. Ordinary paint would not cling to mufflers when they warm up high heat produced by exhausts and will start burning off. Instead, utilize a high-temperature primer or even barbecue paint. Place the car on jack stands after jacking it up.

Steps of painting a muffler:

  • Wrap off anything you don’t want to paint near the muffler. 
  • Clean up the muffler with natural solvents after cleaning it with soap and warm water. 
  • Paint the muffler and exhaust pipe with 3 to 4 layers of high-temperature paints. 
  • Make certain that any welds in the muffler are also coated.
Materials Needed
Hight-temp paint

Coating with powder:

This is one of the most efficient ways to keep corrosion at bay. It can only be done on exhausts that are completely new or have recently been repaired. It may dramatically improve the look of your muffler while also shielding it from the weather. 

The only disadvantage is that it is relatively costly. Because the process necessitates specialized equipment, it can only be carried out by trained experts.

Plating in chrome:

Chrome-plated exhausts are standard on some current vehicles. If yours hasn’t been coated yet, you should think about doing so. It will not only make your muffler extremely glossy and enhance the overall aesthetic of your automobile, but it will also delay the onset of corrosion on the surface. 

Unfortunately, this is a professional treatment that cannot be performed at home and will put you behind schedule. However, if you care about your vehicle’s general aesthetic, it’s something to think about.


In contrast to the previous possibilities, this is one idea that you can implement at home without spending a lot of money. WD-40 is a grease that can be found at most hardware stores. It allows rainfall to drain off the exhaust pipe more rapidly, making corrosion formation more hard.

Keep an eye on things:

It is considerably easier to keep your exhaust system corrosion-free if you brush off minor patches of corrosion as they develop. Keeping on top of the corrosion by removing a small quantity every now and then will save you from actually having to work to remove a large quantity of corrosion all at once. 

Taking little steps at a time can save you time and ensure that your exhaust system lasts longer before it needs to be replaced. If you have any concerns about how to best safeguard your muffler, particularly if it has recently been repaired or if you have recently purchased a new car, you can always speak with your auto dealer or a nearby technician to review your options. 

It’s possible that your muffler is already chromium-plated or constructed of a rust-resistant substance, in which case you won’t need to do much to keep it protected from the environment.

Coat the Exhaust’s External Surface:

With the exception of a few high-end vehicles, most exhaust systems are built of steel, and they are located in one of the most vulnerable areas for corrosion and rust on an automobile. If you’re going to the trouble of rustproofing the underside of your automobile, don’t forget about the exhaust pipe. 

Cleanse and scratch your exhaust system before sealing and protecting it from rust and debris using Exhaust Paints. Our regular Exhaust Paint is an aerosol that can withstand temperatures up to 600 degrees Fahrenheit. 

It’s ideal for everything that goes after the catalytic converter, such as the exhaust manifolds. Eastwood Hi-Temp Exhaust Coating may be used anywhere on the exhaust system for exceptional heat protection. It’s available in three colors: silver, black, and factory cast iron grey. 

Our Hi-Temp Coating can withstand temperatures of up to 1400 degrees Fahrenheit and may be applied to the exhaust system by spraying or brushing. This will double or quadruple the life of the exhaust system while also improving its appearance.

Frequently Asked Questions:(FAQs), “How to rustproof a muffler?”

Can you rust-proof an exhaust?

Coating with powder

This is one of the most efficient ways to keep rust at bay. It can only be done on exhausts that are completely new or have recently been cleaned. It may dramatically improve the look of your exhaust while also shielding it from the weather.

Why do car exhaust pipes rust rapidly?

The coolant will convert into vapor and be expelled via the muffler when it ignites. The steady flow of coolant vapor into and out of your car’s exhaust pipe might ultimately corrode the piping.

Is it normal for the exhaust to rust?

Rust and corrosion are, without a doubt, the biggest enemies of any exhaust pipe. Quick travels in your car don’t enable the moisture in your exhaust system to heat up enough to evaporate, thus if you frequently take short journeys in your car, your exhaust system will corrode faster than usual.

Can you undercoat a muffler?

Invest in an undercoat.

  • While there are conflicting reports on this one, applying an undercoat to your exhaust is another approach to keep it from corrosion.  
  • Some customers believe that having their mufflers expertly painted has been quite helpful in stopping corrosion from accumulating.

Can you powder coat a motorcycle exhaust?

Powder coating a motorbike exhaust is doable, but it is a separate technique. A ceramic exhaust coating can give you the perfect blend. It’s a fantastic technique to maintain or preserve the muffler while also adding a wonderful cosmetic element.

How do I get rust out of my exhaust pipe?

  • Cover a corroded section of the exhaust with an old rag or an inexpensive dishcloth soaked in vinegar. 
  • The stronger the outcomes, the longer you keep the cloth in the solution. 
  • Remove the towel and wash down the pipe with fresh water after it has rested for a bit to remove any loose corrosion.

Is powder coating easy?

Powder coating provides a number of advantages over typical liquid coatings, including being more environmentally friendly, applying thicker without flowing, and being easier to style. Although some parts of powder coating might be challenging, it is by no means impossible, especially for the ambitious.


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