Gary Sullivan covers various home improvement topics. Gary discusses a product called Quick Dam, a water barrier that prevents water damage, and shares a listener's success story with it. He also talks about the importance of addressing air quality and ventilation in homes, especially during warmer weather. Additionally, Gary recommends products like Odor Exit and Easy Breathe for eliminating odors and improving indoor air quality. He also takes calls from listeners, including one about a mold issue in a basement and another about a freeze protection device for outdoor faucets.