Oh crap! I cracked my sump!

[Treebeard]

It is a glass sump. Should I lay a bead of silicone around the inside edge the glass and push it against the cracked piece so that the silicone is pushed out around the edges, or do I set the patch glass against the cracked piece and silicone around the edges? The cracked piece is a location where it can not be clamped to dry.