TNT, I don't.know what you are mounting/hanging, but we have very good luck using 3m Command strips. We've had items hanging for 2 years now & not fallen off the walls, easy to use & remove, no holes in the walls. Also when I hang someting using them I figure if 1 will hold it I use 3-4 as they are fairly cheap.
Danny & Linda
Former '13 FB owner