Gorilla Original Gorilla Glue, Waterproof Polyurethane Glue, 2 Ounce Bottle, Brown, (Pack of 1)

https://www.amazon.com/dp/B0000DD5EN Use a very small amount as it tends to expand with the moisture in the air. I’d recommend using a toothpick to apply a very thin layer then pressing the pad onto place and holding it there with something heavy like a book.