If it's a square frame then it is a simple matter of making some backing
strips of wood that matches the frame. Use silicone on both sides of the
mirror, and then put the wood strips so that they sit flush with the back of
the frame. Make them rectangular, with the shorter dimension going vertical
onto the mirror. Bevel the outer inside edge and drive pin nails into the
frame to secure the strips. I've done this several times when putting glass
into projects (cabinets, clocks, etc.) and it really looks better than
anything else I've seen. For a mirror, where noone will likely see the
back, there might be other ways to do it, although this approach isn't very
difficult.

Mike


"Sam the Cat" wrote in message
...
Folks,

Need bit of advice. I am making a custom mirror frame to match a
vanity
I made earlier in the summer. I have the concept down of building a
pitcure frame to hold the glass with a rabbet from the back but I am
looking
for ways to hold the mirror in the rabbet -- first thought is to use
silicone caulk as a glue but I am wondering if I need some sort of
mechanical means to hold the mirror in the rabbet (in addition or instead
of
the glue/caulk). Of course the mirror will be hung from the frame .....

Cheers