Picture of Paint it white (or whatever you like)
Painting the can white makes the napkin art pop. I dabbed it on with a dish sponge instead of a brush. Why? Because tin is slippery and brushes are streaky, and honestly, I had a sponge nearby. It took 3 coats. I didn’t wait long enough between coats the first time and got weird lumps, so... patience is a virtue here.