Sealing the hatch area is just rubber grommets where the wires go in. Now if your talking about the lense they use black sillicone like that found on windshields. If you need to fix this be suuuuuuuuuuper careful. I tried a few times and have messed up a few sets already. I baked and removed the lenses but you have to watch out for warping, cracking etc etc. May just want to run a bead around the edge first.