Add caulk around window frames as well as around any air intake or exhaust grilles.
How to seal siding from bugs.
And unless you want to cover the wood with epoxy to completely seal everything in i don t think there s an impervious finish against insects.
Caulk is cheap easy to apply and can go a long way towards keeping bugs out.
Simply apply this inexpensive filler into the cracks to seal.
Paint works well over it.
I d use dusts but the ready made hole is far to small.
There are a few spots in siding where you can successfully introduce insecticides.
I take advantage of these tiny holes using pyrethrin aerosols and an injection straw.
First vinyl siding has tiny weep holes at the bottom of each course panel to allow moisture to escape.