In article , Grunff wrote:
No, silicone is the thing to use here. The point is that as it gets
squeezed out, it fills any gaps between the two cut ends. The fact
that most of it gets squeezed out is a /good/ thing.

A tip I got off a website was when you do this to sprinkle sawdust on
the join (after assembly of course): it takes off all the excess
silicone nice and cleanly.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm