Dimensionals: I never have a 'regular' shape, so I cut my own dimensionals from adhesive foam in the kids crafts section of most stores. I just cut the size, shape I need, peel the backing off, then add a dot of good glue to the top of the piece to stick to my item. I have had similar problems from almost any foam dimensional products out there - the glue dries out, the little pieces won't come unstuck from the packaging, etc. HTH!
I am finally able to sit at my studio desk for more than 15 minutes, so I'm hoping to get caught up today. These challenges are ROCKING! I love them all!