I have neve i nstalled any, but have worked on tubs with them in it. What you have heard is true about the water between the liner and the tub. And when you step on it, you can pump the stagnant water out .: Can anyone help me. I am looking into bathtub liners and : am confused. I have read that water can get between the liner : and the old tub cause the liner to float and the tub sdtagnates : creating a horrible odor.: Has anyone out there installed one of those liners and if so : are you satisfied. Would appreciate an answer soon. Thank you all.