Hurricane Hinge: Keeping rain out when hatch is open.

Foolish me didn't realize an open hatch with a hurricane hinge allows rain into the hinge, which then exits through the other side (inside the trailer) during a downpour.
I'd love to use the open hatch as a sort of canopy in the rain so I'm working on keeping rain from seeping into the open hinge.
I have seen in a few pictures a sort of narrow gasket that runs the length of the hinge to keep water out but wouldn't know where to looks for something like that. ... And if I do, how to keep it secured to the hinge.
Seems this has always been an issue so I'm sure there are plenty if ingenious ways y'all figured to keep the water out!
I'd love to hear them.
I'd love to use the open hatch as a sort of canopy in the rain so I'm working on keeping rain from seeping into the open hinge.
I have seen in a few pictures a sort of narrow gasket that runs the length of the hinge to keep water out but wouldn't know where to looks for something like that. ... And if I do, how to keep it secured to the hinge.
Seems this has always been an issue so I'm sure there are plenty if ingenious ways y'all figured to keep the water out!
I'd love to hear them.