Leaky Hatch

So I dont know how many people have this issue but I have figured out how to fix it on my Jeep I used this gnarly neoprene stuff and caulked across the top of my hatch where the seal touch's the hatch a nice 1/4 inch line and POOF the leak stopped I went from corner to corner across the top :thumbup:So Happy no more swimming in the back of my rig YAY

Specifics please. What kind of gnarly neoprene stuff? I have been fighting the same issue for ages.

It's made by Black Jack Neoprene Super Flash Cement #99 EteraFlex liqid rubber series
I bought it at Ace Hardware around 8 bucks a tube fists staandard caulk gun worked on windshield install great also.I went down the side's of the rear window two inches or so and across the whole top 1/8th or so thick