RE: How to fix my sad Serenity?
I would use rubber cement or something along those lines. It will stick better than silicone, but you can still rip it off without damaging the board if you change your mind.
I use this rubbery waterproof glue called "goop". It looks like silicone, but it sticks a lot better. They make different kinds of good for household versus plumbing versus sports equipment repairs, but I think it's all pretty similar.