OP could get med tape, it sticks to surfaces well, but won't stick to skin. We use it in the hospital a lot for patients with very thin skin. That's what I'd used with one of my hides way back when & it worked fine. Obviously you don't want to use duct tape or even scotch/masking tape, but non-adhesive med tape would cover any sharp edges & wouldn't stick to his girl if by chance she lifted it up.