On Fri, 18 Jul 2008 18:25:21 -0700, tonyjeffs wrote:

Thanks everyone for all the info.
I'll try the diezel, or a proprietory mould release agent. And get some
T-nuts.

Knowing the terms alone helps!

Cheers

Tony

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I think you should go for the 'soap oil' option as the other suggested
release agents (diesel etc.) might interfere with the mortar bonding when
you come to build your wall.

Cic.

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