Has anyone ever tried to connect two pieces of floating row cover together to make it wider (not longer)? I'm looking for a technique to join my two 7' wide pieces to be 14' wide, yet joined well enough that potato beetles can't get in.

I've tried my office stapler but it rips the flc in wind (possibly due to sharp edges). I've tried a battery-operated potato-chip-bag sealer (to make a heat weld of the plastic), but it isn't hot enough sometimes and sticks to the plastic other times.

I've been avoiding the sewing-needle-and-thread solution, but it may be all there is left. Except, of course, buying new 15' wide rolls. Any creative alternatives, please?
...Terry