Finish the following sentence with the best choice: How to weatherproof the outside of a birdhouse?

Choices:
- Use kilz  wood staining solution , apply at least 2 coats with brush.
- Use kilz waterproofing wood stain, apply at least 2 coats with brush.

Answer:
Use kilz waterproofing wood stain, apply at least 2 coats with brush.