Because you can not seal everything as tight and a 1/4 gap anywhere Bees, Wasps, and Hornets can get in.

I suggest at least a month before you season - visit your blind and insert a Raid Fumigator or Raid Concentrated Total Release Fogger. 1 can is all you need.

HOWEVER

Read directions on can before use.

Or talk to your local county extention entomologist as there is a wettable powders that can be put in a B&G garden sprayer and you can treat the outside surface area which any insect upon contact with the surface - it will kill them. It is a sirface residual treatment.

Now it is not a good idea to do this a week or days before season. it does have an odor but it will not spook game IMO.

My past profession was insecticidal consumer products.

JW