Leaking Hatches

[Stillraining]

I was at the boat and with our current 18+ inches of wet melting snow on the decks I now notice two hatches leaking.
After scraping off ice and Snow I have determined that they are not leaking at the deck joint but past the actual factory glass to metal frame joint in the lid itself...I can flex the glass and see a .001 or 2 opening between the two surfaces.

How do you effectively seal this?

Is there some penetrating type sealer one can let seep in and seal it up or do you need to pop the whole lens out and re-bed it?..In my mind that would be the proper way but figured I better ask here for some experience knowlage on the matter...and will it break needing a new lens ready made to go in?

Sorry this is the best picture I have of the hatch..as you can see it has a frame around the Plexiglas so its not a sealing issue with a gasket and dogs some may think