Sealing around tail light asse,bly

I replaced a rear tailight assembly on my Contour with one from a recycler. The Foam rubber seal had dissintegrated when the part was pulled. I now have a leak into the trunk when it rains. How do I seal the tailight assembly?

Clear silicone sealer. Get a good one like Dap or Dow-Corning. Make sure it’s formaldehyde free.