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What Miles said. A local sign shop, any one that offers car signs may be able to slide you some pieces off the roll at a lower price than usual. If not, I may have some lying around, but I think it...

Borrow a magnet sign off of a van or truck. They are longer, stronger and have no adhesive backing.

I'm not familiar with PL. I think any basic white glue, epoxy, just about anything will do. With thick leather it's unlikely that the glue underneath with cause problems with the surface unless...

Sure. Why not.

You could also visit the dollar store or michaels crafts and pick up some magnet sheets. I picked up magnet sheets 8.5" x 11" for about $1. The sheets are light duty fridge magnet...