My go-to product for similar repairs is "shoe goo". It is for shoe repairs, but seems to work in situations where rubber cement is not good enough. I have not tried it on your particular problem, but it may be worth a try.

Here is a link that might be useful: shoe goo

i like to know whats works allso ?
i was thinking " Gorilla Glue " we have used this to fix flaps on conveyor belts.
the only thing i didnt like abouhgt Gorilla Glue is it drys with a lot of air bubbles in it all most like a foam? but holds up like a rock....

I am considering Silicon caulking. The neighbor's kid but a golfball through my poly GH roof so i thought i'd cut two 1 foot square poly sheets and coat each with the silicon, then paste them on either side of the hole.

Keep in mind that i have a special GH where i will need to stop leaks completely (google solaroof to see why).

I know there is tape you can get but it never seems to last as long as the poly.

Poppa

You might consider trying one of the hot melt glues specifically formulateded for plastics.