These coins were adhered to a self-adhesive mesh backing.  This different type of mesh backing has no effect on the tiling process (thin-setting and grouting are the same); however, you may notice the sheets themselves are a bit more flexible, and their back sides are slightly tacky; thus, they are separated by waxy paper.

 

These metal tiles may tarnish or patina over time.  We have had success sealing penny tiles with an over-the-counter product called Minwax Polycrylic Protective Finish. Epoxy resin coating is another popular method to seal the pennies. We make no guarantees with either of these products.

 

Penny tiles are ready for thinset, mortar, or mastic and unsanded grout or epoxy.  Experienced or professional tile installation is recommended.