So if I can hardly smell the scent, does it mean I need to reapply again or the fragrance is actually not important?
No need to reapply. After a few hours 4-6 hours you can and Ammo, A314 or Tuth 6-8 hours. They are still jumping off even if you can’t smell them.
Now you can use a cover with most and that also helps get them in the air.