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.
How to seal siding from bugs.
First vinyl siding has tiny weep holes at the bottom of each course panel to allow moisture to escape.
There are a few spots in siding where you can successfully introduce insecticides.
I d use dusts but the ready made hole is far to small.
Seal small cracks and gaps in your siding under 1 4 inch wide using an acrylic latex caulk.
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.
Add caulk around window frames as well as around any air intake or exhaust grilles.
Simply apply this inexpensive filler into the cracks to seal.
Paint works well over it.