There are a few spots in siding where you can successfully introduce insecticides.
How to seal siding from bugs.
I take advantage of these tiny holes using pyrethrin aerosols and an injection straw.
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.
Use caulk to patch small cracks in foundations and siding or use it to seal joints where the siding meets the roof or foundation.
Simply apply this inexpensive filler into the cracks to seal.
Add caulk around window frames as well as around any air intake or exhaust grilles.
First vinyl siding has tiny weep holes at the bottom of each course panel to allow moisture to escape.
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.