I've had good results with this https://www.amazon.co.uk/Evo-Stick-Impact-Adhesive-Strength/dp/B002NPTNIK/ref=sr_1_12?crid=2KQYW9U2W0GOT&dchild=1&keywords=contact+adhesive&qid=1614959532&sprefix=contact+ad%2Caps%2C213&sr=8-12I glued my passenger mirror glass back onto the backing with it and its still holding firm.