well during this last few rain storms i found that i had a leak
where the hatch meets the top, my plastic over the edge had torn and sun degraded exposing the joint to direct water entry
with the old tore off:
I went looking for a rubber seal of some sort and got this:
its a garage door bottom seal. black vinyl rubber all weather rated.
I cut the lips off the rubber and used the existing screw to hold it to the hatch:
I fiber glassed the other side in and fixed a few cracks while at it:
added some paint and its better then what I started with. the seal was ~$8 for 10' by 2" and about 1/8" think.