mo wrote:

Anyway, the long and short of it is, which types/brands of glue are the best
to use for plastic to plastic?

And the short answer is "it depends". It depends on what sort of plastic
it is. IIRC Ford liek to use ABS plastic for wing mirrors so you need to
find a glue suitable for ABS.

Possible one of these two glues will work:

http://www.maplin.co.uk/module.aspx?moduleno=46010
http://www.maplin.co.uk/Module.aspx?ModuleNo=46013

But I agree with Paul, buy a new wing mirror and do it properly. You'll
never get a glued mirror to look right, especially since you've already
had one ballsed up attempt at doing it.