In the old days I would have reglazed a metal window frame in much the same way as a wooden one: scraped out all the gunge, put a smooth, thin layer of linseed oil putty all around the frame, eased the glass into place and replaced the beading but I suspect that a) that might not have been the right way and b) that's not how people do it nowadays.
Is it all done with silicon sealant today? Any useful tips would be much appreciated.
Thanks,
Nick