There is nothing better in the world to make a seal when the integrity of the membrane is damaged than to add/attach an element. Clean substrate surface (soap/degreaser/alcohol/acetone); Stick the Eternabond to your app/device flange and double the clear strip so you can pull it out after positioning the device [you can't move it after sticking]; drill self-tapping screws through the mounting flange. Work above 60+°F and store EternaBond in the freezer/fridge for easier handling during use.
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