What's the Deal with Red vs Blue Threadlocker for Cars?

Technical Discussions
1

I’m diving into some automotive repairs and keep seeing mixed opinions on using red vs blue threadlocker. From what I’ve gathered, red threadlocker offers a super strong bond, which sounds great for components that won’t be taken apart often. But I’ve also read that blue is more suited for bolts that might need to be removed later without too much hassle.

Here are some specific points I’m curious about:

  1. Applications: When should I really go for red? Are there certain automotive parts that are better off with it? And for blue, what situations call for it instead?
  2. Personal Experiences: Have you guys used either of these threadlockers on your cars? What was your experience like? Any tips or tricks?
  3. Manufacturers Recommendations: Is it true that some manufacturers recommend one type over the other for specific parts like oil filters or suspension bolts?

Any insights or real-life usage feedback would be appreciated! Thanks!

5 Likes
2

Red threadlocker is typically considered high strength, great for securing bolts that shouldn’t come loose, like those on the engine. Blue is medium strength and allows for easier removal—perfect for non-permanent applications. What are your specific uses?

3

That’s a great breakdown! I’ve used blue for things like valve covers and it worked out perfectly. When would you say red is necessary?

4

If the bolts are in a high-stress area or subject to vibration, red’s your go-to. But for most everyday applications, blue does the trick without the hassle of heat when removing.

5

I learned the hard way once! I put red on parts I later needed to remove. Not fun, let me tell you.

6

Yes! I’ve had that experience too! Red is for permanent applications—stick to blue for things you might need to service later.

7

What about temperature resistance? I’ve noticed some threadlockers mention that. Does red offer better heat resistance than blue?

4 Likes
8

Actually, yes! Red threadlocker typically withstands higher temperatures better than the blue variant. This makes it suitable for high-heat environments like engine components.

9

That’s good to know! I didn’t realize that. I plan to use it on my exhaust system bolts.

4 Likes
10

Just be careful when applying it; you want to make sure it’s the right application, or you could make future repairs a lot tougher!

11

So, can you mix them, or is that a bad idea? I’ve heard conflicting opinions on that.

8 Likes
12

Mixing isn’t advisable! It can interfere with the bonding process and weaken the hold of the threadlocker. Stick to one type per application.

13

Agreed! It’s like mixing different glues, just doesn’t work well. Stick to what each is designed for!

14

Definitely! Plus, the colors make it easy to remember which one does what.

15

Haha! Exactly! Red for ‘will not budge’ and blue for ‘easy come, easy go.’

16

A perfect way to put it! I’ve teetered between blue and red before, but I’ve learned my lessons.

17

In the end, it all comes down to the right application and knowing if you might need to remove it later. Choosing wisely makes all the difference!

18

Red threadlocker is stronger than blue, but you need to be careful with application. Always clean the bolt and hole with a degreaser before applying. This ensures a good bond!

19

That’s great advice! What degreasers would you recommend for that prep work?

20

I’ve always used isopropyl alcohol for cleaning. Just make sure everything is completely dry before you apply the threadlocker. Curing time is crucial too!