Caulk is cheap easy to apply and can go a long way towards keeping bugs out.
How to seal siding from bugs.
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.
Seal small cracks and gaps in your siding under 1 4 inch wide using an acrylic latex caulk.
There are a few spots in siding where you can successfully introduce insecticides.
Instead i d probably just let the siding thoroughly dry in the sun checking for signs of bugs during that time then go ahead and use it.
Paint works well over it.
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.
Add caulk around window frames as well as around any air intake or exhaust grilles.