Can you fix a flat spot on your floors? VERDICT: YES! If you have a soft spot on your floors, you can easily fix the problem by using a can of minimally expensive foam (I used gaps & cracks door and window) and an air pump nozzle. Attach the pump nozzle to the applicator wand and secure with tape. Practice spraying the foam onto a paper plate to get an idea of how much it will expand and how quickly it comes out of the can. I recommend getting a lot of paper towels because it can be very messy a