EPDM and rubber cement?

I need to secure the folds of a EPDM liner. This is NOT a matter of joining
two pieces, just eliminating a flap. Can rubber cement be used instead of
that expensive joining tape? If I had it all to do over, I would have
scrapped that new piece of EPDM in favor of a factory-made, drop-in Permalon
liner . . . but I already had the EPDM. Now I have to deal with the folds.

Suggestions?

Lee