High Temp Exhaust Manifold Sealant Recommendations?

Maintenance & Repairs
1

I’m currently working on a project involving my car’s exhaust system, and I’m in need of a reliable high-temperature exhaust manifold sealant. I’ve run into some issues with exhaust leaks in the past, which have definitely affected my vehicle’s performance and emissions.

What I’m Looking For:

I’m particularly interested in finding a sealant that can withstand the extreme temperatures generated within the exhaust manifold. Here are a few things I’m considering:

  • Temperature Resistance: The sealant should handle high heat without breaking down or losing its sealing properties.
  • Ease of Application: I’d prefer a product that is easy to apply and doesn’t require specialized tools.
  • Cure Time: I want something that sets quickly, so I don’t have to wait forever before getting back on the road.
  • Brand Recommendations: If you have experience with specific brands, I’d love to hear your thoughts!
  • User Reviews: Any insights from people who’ve used certain products would be greatly appreciated.

Questions:

  1. What are the most trusted brands for high-temperature exhaust manifold sealants?
  2. Are there any formulations to avoid?
  3. How much product will I need for a standard exhaust manifold?

I’m looking forward to your suggestions and experiences. Thanks in advance for your help!

5 Likes
2

When selecting a high-temperature exhaust manifold sealant, look for one with excellent heat resistance, ideally rated over 500°F. Chemical compatibility with your exhaust gases is also crucial.

3

Exactly! Also, check the curing time. Some cure quickly while others may take hours, which can affect your project timeline.

4

I’ve had great luck with silicone-based sealants. They withstand high temperatures and offer good flexibility, which is important for exhaust systems that expand with heat.

5

Good point! Speedy curing can save you a lot of time, especially if you’re in a rush to get the vehicle back on the road.

6

Don’t forget about weather resistance! Some sealants perform poorly in rainy or humid conditions, which could lead to future leaks.

7

Absolutely! I’ve learned that the hard way. A good sealant should also be resistant to oil and fuel.

8

I recently used a product that promised a quick cure, and it worked wonders! Just make sure to follow the manufacturer’s instructions for the best results.

9

What about temperature fluctuations? Is there a sealant that handles extreme changes well? I worry about that in my climate.

10

That’s a valid concern! Look for sealants that explicitly mention thermal cycling in their properties.

8 Likes
11

A little humor: It’s not just about sealing things up—it’s also about keeping your exhaust from playing peek-a-boo with the street! :smile:

12

LOL! That’s true! A good sealant can certainly save you from unwanted surprises down the road.

13

In reflective thought, investing in a quality sealant pays off in the long run. It’s worth the few extra dollars to avoid repeated repairs.

1 Like
14

For exhaust manifold sealant, I recommend using a high-temp silicone sealant. Make sure to prep the surfaces properly by cleaning them with a degreaser and sandpaper to ensure a good bond.

15

Great tip, qlowe! I always use a wire brush to clean the surfaces too. It really helps with adhesion!

16

I’ve had good results with Permatex Ultra Copper. Just remember to let it cure fully before you start the engine. Patience pays off!

17

I’ve heard of that! Do you let it cure at room temperature or do you heat it slightly while curing?

18

I usually let it sit at room temperature. Heating it can cause premature hardening, which might lead to cracks when it cools down. Just follow the recommended curing time on the label.

19

Do you guys think it’s better to apply sealant on both sides of the gasket? I’ve heard mixed opinions on that.

2 Likes
20

I generally stick to applying it on one side, especially with high-temp applications. More sealant can actually be bad if it squeezes out.