On 07/02/2018 18:53, Cursitor Doom wrote:
On Wed, 07 Feb 2018 08:51:58 +0000, Martin Brown wrote:

In reality corrosion tends to stick steel nuts and bolts together on
Earth which can make penetrating oil essential to get them apart.

Personally I've never had a single success with so-called penetrating
oils, not one time in 40+ years, not ever. The only thing I've found
that's guaranteed to work is heat; not just butane or propane heat, but
oxy-acetylene heat. Heat the ****er up till it glows bright orange and
away you go. Never known it fail.

I had one thread, a trunion, that seemed to seize with heat. I'm sure it
was worse afterwards. However the clearances might have been tighter.

I felt that the grease that may have been in the threads turned to soot
and made turning more difficult.

However that was a one-off and have seen heat assist removal of nuts
from bolts.