On 01/10/2012 13:07, GMM wrote:
At work, they've been draught-proofing the old windows. It seem that this has involved squirting a big
bead of silicone along each mating surface, then closing the window until it goes off. Good (if
temporary-feeling) idea for some locations as it moulds to the right shape. Once cured, the silicone stays
on the one face.

They didn't do my area, so no chance to find out how it was done, but they must have used some release
agent on the 'uncoated' face for this to work.

Any idea what they might have used as a release agent?

When I saw something like this done, they put tape down one surface
(e.g. insulating tape), squirted silicone down the other face, and
closed for a few hours. Opened the windows, removed the tape.

The windows were metal casements, and I think they put tape on the frame
itself and silicone onto the opening window. It did not work very well
simply because the frames were dirty and paint somewhat flaking before
they started - and that was not properly addressed.

--
Rod