We have a dog door that fits into a sliding glass door. Unfortunately door frame itself is not completely even, and as a result we couldn't get a good seal to keep our drafts. White Window Weather Sealing Tape to the rescue! It was so easy to apply - and virtually disappeared on our white enamel slider frames - that we sealed both inside and outside. It even makes the installation appear seamless because it blends in with the frame. Very pleased...now to see how well it lasts in our desert climate. I'll post a follow-up review if there are any short-term issues.