When Fluon is applied, the water evaporates, leaving behind an incredibly thin, dry film layer of PTFE particles. PTFE is a very slippery plastic. If you then brush another layer on top of this thin film, it will disturb the dried layer underneath, rubbing it off and rendering the application useless for containing insects.
First, you must use a damp paper towel to remove all the Fluon which was improperly applied. The clumps of Fluon allow insects a foothold on which they may climb, and drastically reduce its effectiveness. Allow the surface to dry completely, and verify it is clean and that no Fluon particles remain. It may be necessary to clean the surface several times if all the Fluon is not removed the first time.
Then, apply only a single coating with as few strokes as possible. Try not to go over the same area more than once. If you must apply over the same area more than once, ensure that the area is still wet and that the dry film layer has not yet formed, which, in some cases may take only a few seconds, or else you will once again see the pieces of Fluon film which have clumped together and flaked off the surface.
If you read elsewhere that two or more coatings should be applied, ignore this. The writer does not understand how Fluon works, and should not be offering instructions on how to use it.
Edited by drtrmiller, May 26 2018 - 3:44 PM.