Exhaust paste, sometimes called exhaust cement, is made so that gas-tight seals can be formed over joints when you’re making any type of repairs to your exhaust system. Getting the perfect seal isn’t difficult if you have the right product, but it is still important to remember that you have to follow the manufacturer’s instructions closely if you want to get the best results.
Most exhaust paste is heat-resistant, which is necessary because of how hot the inside of your car can get. They are the perfect way to make repairs to your exhaust system without welding the product tight, and they can certainly save you a lot of money over taking your car to a professional mechanic. Although they're generally quite cheap to buy, our list of the 5 top pastes for exhaust repair should help you get purchase right first time.
Best Exhaust Repair Paste in the UK Reviews
#1. Holts Gun Gum Paste 200g
This is a very popular brand of exhaust repair paste, and when you buy some you’ll completely understand why this is so. This paste will permanently repair all types of small holes and leaks in exhaust systems and silencers, giving you back the vehicle you had when it was much newer. Each time you use it, you get a gas-tight seal that you can count on to stay that way for a very long time, and its price is affordable for everyone.
One of the reasons this paste is so popular is that it gives DIY enthusiasts a way to get professional results at home. Problems with your exhaust system, in other words, no longer require that you take your car to a professional mechanic and spend way more money than you feel comfortable doing. This paste can repair straight pipes, curved pipes, and tailpipes, and the job is done so well that you’ll automatically save the costs of purchasing a new exhaust pipe.
- Decent quality product
- Very reasonably priced
- Gives you gas-tight seals with every job
- There are stronger pastes out there
Verdict: Best overall for the money
#2. Liqui Moly 3342 Exhaust Mounting Paste 150g
This is a long-lasting product that is heat-resistant and therefore lasts a very long time after it is applied. This is a great alternative to spending tons of money at a car repair shop, and it works on all types of repair jobs. By using this paste, you get fast, easy, gas-tight assembly of pipe and flange connections on all types of exhaust systems, providing you with a very versatile tool in the end.
Even better, this product contains no asbestos and never pollutes the environment. It also allows for dismantling without total destruction, which means even your older cars and exhaust systems will stay in good shape for longer periods of time. Keeping your exhaust system up and running is much easier when you have a way to make repairs before they become too serious, and that is just what the Liqui Moly 3342 exhaust mounting paste allows you to do.
- Heat-resistant to last a long time
- Reasonably priced
- Works on all types of exhaust system problems
- Instructions aren't that clear
#3. Liqui Moly Exhaust Repair Paste 200g
Being one of the more expensive options, this repair paste is perfect for all exhausts, and even if you have no mechanical ability whatsoever, you can still eliminate leaks and repair all sorts of cracks and holes in your exhaust system quickly and easily every time. The paste is designed to be both simple and economical, not to mention fast, and its heat-resistant formula means it is guaranteed to last for many years to come.
The Liqui Moly exhaust repair paste is also asbestos- and solvent-free and nonpolluting as well, so you can use it without any concerns about damaging the environment. Seal small cracks and holes and make them gas-tight every time with just a few simple steps, because from the start of the project until the end will never take you very long. This is definitely one exhaust repair paste you can count on time and time again.
- Makes repairs simple and fast
- Repairs all types of cracks and holes
- Tube can sometimes be difficult to open
- Slightly more expensive
#4. Holts Firegum 150g
This tube of exhaust assembly paste not only does a great job at stopping all types of leaks, but it is also great at withstanding both heat and vibration, meaning it is super easy to apply. It provides you with gas-tight seals in various joints due to a poor fit or a failed gasket, and with its price, it is a very affordable alternative to much more expensive auto shop repairs. Once the piece is repaired, it will stay that way for a very long time, thanks to the reliability of the product.
Even on stainless-steel joints, the Holts fire gum is a true miracle-worker. It takes but a few minutes for the job to get done, and its heat resistance means that job will last for many years to come. Affordable and reliable, this exhaust system repair paste is one item you won’t ever want to go without in your tool box because indeed, it is a very versatile as well as high-quality product.
- Gets the job done quickly and easily every time
- Heat-resistant to last for many years
- Very cheap
- Not the best quality, but sitll value for money
#5. J-B Weld ExtremeHeat™
Specially made to repair iron, metal, and steel in high-temperature environments (1300° C), this is a very reliable repair paste that works miracles when repairing holes and cracks on pipe connections and all types of metal surfaces. It doesn’t just work on your exhaust system. It also works great on mufflers, outdoor grills, gas and commercial furnaces, fire boxes, and water heaters, among others. It is water-based, nonflammable, and contains no solvents or volatile organic compounds (VOCs).
In a tube, you get a lot of value for the money with this product, especially once you discover all the things it can do. The product is also available in a package of two or three containers, so if you’re planning to use it frequently, you can save yourself some money by getting the larger packages. Once it’s fully cured, this metallic compound can be sanded, machined, or drilled, making it a very versatile product indeed.
- Ok price
- Heat-resistant and made to last
- Super easy and fast to apply
- Quality could be better
- Drying times can be quite long
Paste for Exhaust Repair Buying Considerations
The first thing you may want to consider when researching repair paste for your exhaust system is its heat resistance, which is important because once you make your repairs and start up your car, the heat from the inside of that car is going to be awfully fierce. This is why it is important to find repair paste made specifically for your exhaust system and no other part of your vehicle. Make sure the repair paste is specific to your exhaust system, in other words.
Cost for Volume
The one thing you’ll likely notice with any of these products is how inexpensive they are. A good repair paste doesn’t have to cost a lot of money, especially if it’s made by a reputable company. Doing your due diligence will familiarise you with the names of some of these companies, which goes a long way when deciding which one to purchase in the end. Also take into consideration how many grams of the solution are provided and whether it's value for money.
The important thing to remember is to make sure you do just as the instructions say you should do, which greatly increases the likelihood that the project will be correct once you’re finished. Some instructions provided, however, are a waste of time and will require a bit of searching around online.
If something is wrong with your car’s exhaust system, you shouldn’t automatically assume that only a professional auto mechanic can take care of the problem. Mechanics are expensive, but it is entirely possible that the job can be done with your own two hands in your own driveway. This can save you both a lot of money and a lot of headaches, especially if you’re on a budget, and it is easier to do than you might think. Good pastes at an affordable price aren't that hard to find, though we have gone to the trouble of providing what we believe to be the 5 best exhaust repair paste treatments out there for every exhaust scenario.
Last Updated On: February 26, 2021.