Last night I was grilling and went to open the slider screen… whooops my hand slipped and I broke a nail. My hand slipped because the slider screens tracks were dry due to all the rain and humidity. I took out my Bee’s Knees Zipper Wax and hit those tracks … in seconds those stuck screen doors and stuck patio doors were opening like a “hot knife through butta”… BKZW also works on stuck windows and stuck doors, that are stuck because of humidity! Bee’s Knees Zipper Wax has hundreds of uses! Try it for your self!