The grip is not strong at all. Using a hair dryer definitely helps, but still not as much as I'd like. It remains to be seen whether it is waterproof and how long it will last. If using in a bathtub, note that this tape should ONLY be cut in straight lines. You CANNOT bend it around the corners of the tub. Thus, the finished product will have a lot of seams. Overall not a bad product but I would call it a temporary solution. Please caulk the tub properly. I used this to hide my messy sealing work where the tub meets the floor.
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