Derek ^ wrote:
My Smeg electric DO4SS-5 oven is about 18 months old but in the last 3
weeks the inner glass in the oven door has come loose.

Removing and dismantling the door it appears that the glass is simply
bedded on a bead of some compound (silicone?) and that's it, no
mechanical fastenings at all.

The loosening took place over a few weeks and since the original
system of adhesion has already failed once I am a bit of a loss to
come up with a susbtitute that will perform better, especially since
the open gap has permitted all the surfaces to become contaminated
with a typical oven door window, congealed grease, burnt deposit.

Supposing I can get the surfaces clean again, what adhesive could I
use that would bond glass to metal (or the existing bead of compound)
that would be reliable at 250c ?

It's a Smeg (pricey and perceived to be high quality, I understand) and
only 18 months old. Regardless of any guarantee, I would say the
retailer is clearly liable to fix it for you under the sale of goods
act, unless of course you've mistreated it in some way.

MBQ