On Thu, 16 Feb 2012 06:23:46 -0800 (PST),
wrote:

I am having to re tile a portion of my shower cubicle which leaked. I
have replaced the lower section of damp plaster board with Aquaboard.
I was wonder whether it was worth using bath trim for the joint
between the bottom of the tiles and the shower tray, or just a bead of
silicon. If I use the trim what do I do at the inner corner, just cut
at 45 degress and lots of silicon?

Use the trim that fits under the bottom tile (is actually tiled over)
and juts out over the tray. Fill the trim with decent quality silicone
- not the cheapy universal stuff. For the corner, mitre, as you say.