We're constantly having to spray Paper Wasp nests as soon as one is started under an eve. However, they also like to build them underneath bench seating on our deck, and it's hard to spot the nests. Is there anything we can apply to discourage them from building in certain locations?
The only thing you can do is to spray the areas regularly with a "REPELLENT" chemical such as Bifen. Spray all of the eaves, under the bench and anywhere the wasps tend to build nests. A simple hand held sprayer will work fine. Here is the link.