Sideshow quoted me this nonsense in their e-mail which really frustrated me but at least they agreed to replacement...though they haven't replied yes to me yet.
I'm pretty sure the armor parts are not hand-painted, and this should not be an acceptable norm for a figure of this price.
"Please know that after comparing your photos to our in-house sample and a few stock pieces, we have found that your request regarding the white marks on the abdomen appear to be a common variation, as all the collectibles I examined looked similar to your current item.
Please keep in mind that all of these collectibles are hand-painted by individual artists, so there will be slight variations in the paint application and detail work between pieces. Please be advised that any replacement we may send you will be extremely similar (if not completely identical) in regards to the white marks."