On 2008-05-21, David R. Birch wrote:
wrote:

Threadlockers won't cure in the presence of oxygen, nor in
absence of iron unless a primer is used. So on brass or aluminum they
don't cure well without the primer (or accelerator or catalyst or
whatever you want to call it. Loctite sells the primer. 7649N or some
such number.
Loctite 222 is purple low-strength stuff for small
fasteners. Smal screws will twist off with stringer threadlockers. 242
is blue and medium strength, and is handy for sealing air line
fittings. Sets almost instantly. 262 is high-strength, red. 292 is
green and runny for wicking into already-fastened parts. There are a
bunch more, like RC680 for retaining bearings and so forth, and
another for sealing hydraulic fittings. Forget the number. Go he
http://www.permatex.com/products/Aut..._compounds.htm

Dan

What would be the best for securely fastening a military Mauser rear
sight base that surrounds the barrel? It does not have to be easily
removed.

Well ... mine was soft soldered in place.

And I think that the repeated (though small) expansion of the
barrel during firing will break the joint of any threadlocker like
Loctite, which gets rather brittle as it sets up.

Enjoy,
DoN.

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