Remember that all of the bugs typically found on the lake on summer days are in the last few hours of their life, their life cycle is coming to a close. Those little devils that get into your eyes,nose and ears could care less that you are trying to keep them out of you boat and life. How can you make something more miserable that is already dieing? The exception would be what looks like a common stable fly which are those biting little you know whats that every body hates. Have heard reports that the Thermocell works on those biting flies. I do another approach, I spray my boat with home defense 3 or 4 times a year, once they land on a surface that has been sprayed they are not long for this world, they don't bother me as much as they used to.