... quality butyl rubber material as backing adhesive on a flexible anti-mildew strip for a permanent, watertight seal with beautifying finish. ... wall;Works as a substitute for traditional caulking. It's mildew resistant and will not crack or discolor1,Features1),Smooth Surface ... even during high/low temperature and moist environment. 3),No Mildew 4),Self Adhesive, easy to use 5),Eradicate bathroom joints ...