ppoz Hi Eric, thanks for your interest in my designs. The WSF plastic (both white and dyed) is very strong and durable. Since the surface is porous I recommend sealing it with clear coat or similar before writing on the faces.
ppoz It's not isohedral, thus probably not perfectly fair. That's why if you label 1 to 10 it you should choose a labeling scheme where opposite sides add up to 11. Or if you label it 0 to 9, choose a scheme where opposite sides add up to 9.