The painting is done, but there are some parts of the playfield art that take a different approach. Namely, the black circles around the inserts and the six scoring labels that I repainted. That's where we use waterslide decals - the same kind that come with model car and airplane kits.
First, I created a graphic with the text and shapes that I need and printed it on special decal paper in four colors (even though it's all black) on a laser jet printer. Then, I cut out the shapes, soaked them one at a time in water, placed them on the playfield and slid the backing paper out gently. Here's the work in progress:
The L and P have decals and the A and I do not. Two down, 22 to go. Here's that same part of the playfield an hour later:
Just for comparison, here's the whole playfield before decals...
... and after:
A vast improvement, I'd say.