Quote:
Originally Posted by Matt Cartney
Loctite and Copperslip are different. Loctite is a bit like glue. It stops bolts working loose by sticking the threads together. It comes in different strengths for different applications. Threadlock is the strength you want. Don't use too much. Use it on bolts that are likely to shake loose. Because it effectively excludes water and air from the thread it prevents corrosion, therefore you don't use it in conjunction with grease. While it stops bolts shaking loose it does not prevent them from being undone when required.
Copperslip is essentially grease with copper in it. It provides a very water resistant and long lasting lubricant for threads. Good for most nuts and bolts that do not require loctite.
Matt 
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Very good point! I'd forgotten about all that vibration out there, and me an ex enfield owner
The one to avoid is permanant loctite (red?). That's the superglue of threadlocks and needs a blowtorch to get it out. The others are like gel or powder when set and fill the gaps as Matt says.
Copperslip's main use is with stainless fasteners going into mild steel or alloy. The water resistance prevents the other thread rotting to match the stainless which is then a real pain to drill out. Talking of which, anyone care to add to the following for getting a stuck fastener out:
1. Penetrating oil and leave overnight.
2. Heat
3. Impact gun (Argos/RAC in the UK do a very effective electric one)
4. Rock back and forth with a long bar.
5. Drill out and/or use stud extractor.
6. Spark erode to get out broken stud extractor
For a rounded hex, hammering on an undersize (Imperial) socket or welding on another nut or socket can work. This is harder with a rounded allen key socket.
As you can see I've done my share of bodging
Andy
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