are you asking about the 212th Utapau Shadowtrooper, or the shadow stormtrooper? For the clone, flat black is actually right-on, but you have to bondo for seamless, and that will require paint (as you know from your shocktrooper). For shadow stormtrooper, it is to be gloss black, so HIPS would require painting. However, for the Novatrooper Sentinel, flat black is actually pretty darned accurate, so unpainted black HIPS is a perfect option. That is what I made mine of to be exact.