I didn't coat them with anything, because I wanted them to stay absorbant. The Stayz-on ink doesn't run - trust me, I tested it! I put felt pads on the back. They pads have adhesive on the back, so all you do is peel and stick.I wish I had a cuter stamp to use for them, something more her taste, but she'll probably go out and make her own now anyway! Isn't that an easy project?
I've been doing some knitting, spinning and sewing, and even a little "crafting". My youngest daughter and SIL just moved into their new house, and I made them some coasters. Lest you think I'm really chintzy, I bought them a new fridge, too! For the coasters, I bought some tumbled slate-type tiles at a flooring store in Jacksonville, a mere .33 a piece. I used Stayz-on stamping ink, and one of my favorite rubber stamps to stamp the fronts.