Did a couple paintings for friends, and decided to turn them into coasters! Art that is functional! :D
The painting side has been coated with an isolation coat followed by a satin acrylic varnish (so it's waterproof). The wooden frame of the canvas was stained and sealed with polyurethane (so it's also waterproof), and a piece of cork was added.
I'm offering these as a new commission option: For $45, you can have your fursona on your own personal coaster!