No matter how well a vinyl floor is installed, bubbles can appear days, weeks or even years after installation. That's because moist air rises from below and gets trapped under the surface, causing a bubble. Fortunately it's easy to fix. For small bubbles (an inch or less in diameter), use a large needle to prick the bubble, allowing the trapped air to escape. Then use a towel and a hot iron to heat and flatten the vinyl. Use a stack of books to weight it down -- until it rebonds. For larger bubbles, use a towel and iron first, and carefully cut an X with a sharp razor knife. Pull back the triangle cuts and add floor adhesive. Press the cuts back in place and weight it down. But, be sure to put down a sheet of waxed paper first, so you don't wind up with a stack of books glued in place in the middle of your floor. Finish the job with clear vinyl seam sealer. And that's the On The House tip for today.