Thing is, if you were replacing the glass you would bed it onto putty.... but in this case it is already installed and as I read it OP wants to seal any slight gap rather than bed a new piece of glass? If you imagine a piece of glass already in a metal frame you don't have a recess to spatula putty into, you merely have a very fine small step from the glass to the metal? Putty is surely going going to be messy and unlikely to be very hardwearing with such a tiny bead?
Those who think they know it all are very annoying to those of us who actually do.
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