Here is my mask and hopper I just finished up. I was a little bored and the white on my mask was not doing me any favors in wood ball.
I used 2 coats of plastic primer, 3 coats of paint, 4 to 6 coats of matt sealer. So far its working pretty well. Unfortunately I can't find Krylon here in the UK but the combination of the plastic primer and the sealer seem to be working well. I printed out the design on sticker paper, placed it where I wanted it and used a razor blade to cut it out, and then sprayed with the contrasting color.
Let me know what you think.
Mask - black applied.
Hopper - white applied.