There weren't any decals in mine. I foiled the letters before primer and paint and made sure it was smooth, then as I did each layer I used an eraser to rub the paint off the layers. Worked like a charm.
No idea. When we moved, I had to remove them all from boxes and put them into plastic bags because we didn't want the bugs following us. Each kit takes up one freezer bag, and I have 4 large tubs full, plus the top of the shelf in the closet and some I've bought since we moved in boxes (probably about 20 more). And I keep buying.