Review on Frost King U37H Bottom 36 Inch: The Ultimate Weather Seal for Doors and Windows by Scott Decoteau

Installing on a fiberglass exterior is a little tricky if you want a correct installation. And you should use some transparent waterproof sealant (roof or window) when installing outside. When heavy rain pours on the door, water tends to run into the product, and when the door is opened, water flows onto the floor from below. The rubber seal on the bottom broke after a few weeks and became unusable!