I checked the official datasheets previously for the Mammoth tapes and they make no claims that the product is waterproof.
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<div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.7999992370605px;">I personally found that it didn't tolerate the continuous water treatment on my bumper protector. I wouldn't recommend it for this application. In my opinion it's better to use a car body moulding adhesive tape which is specifically made for this.
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