My girlfriend s dad (who is a builder) keeps trying to get me to dot and dab a wall in his house with half inch foilback. Iv never even tried to dot wuth it before. I keep telling him that it wont stick. He says hes seen someone do it before and its worked. It wont work. Im starting to question my judgement lol. I always heard mixed things bout dotting with the stuff. Can u or can u not???