Well, Mat sits on the floor in front of the kitchen sink and gets kind of dirty.
So I gave him a bath and threw him in the washer.
I mixed fabric medium in with the paint when I made this, but obviously didn't add enough.
I was going to re-paint it and add more medium this time, but I decided to fill in the blank spots with a black Sharpie instead.
And it worked! This is even after another washing.
I'm thinking the next time I make a mat like this I'm going to skip the paint all together and go straight to the Sharpie.