Ignorance is bliss, I suppose!
One day, on a beach in Mexico, I got fed up with the
critters coming thru the holes in my pop top screen &
decided to replace it then & there (!) with a fresh piece
of fine meshed, no see 'em material.

Did the job by hand, with nothing more than a pair of sizzors,
a box of straight pins, & a needle & thread.
I just cut the old screen away from the zipper, then pinned
the the screen into position, smoothing it out as I went, then
sewed it to the edge by hand.
Nothing to it!
It took a couple hours.  I sat on the edge of the upper bunk
for most of the work.
No need to make this job harder than it needs to be!
I was bug free two hours later.

Give it a try,
Phaedra
'85 Westy Basecamp