I gave it a nice even coat of paint, and removed the stencils while the paint was still wet. You don’t want it to dry before removing your stencil if you can help it, because it can peel the paint off with it when you do. (If it dries more than you mean for it to, try running a utility knife along the edge of your stencil before removing it to be on the safe side.)
Tadaa! It’s like a whole new piece, now! But question… what should I put in there to avoid filling it with (and subsequently emptying it of) candy??