Deny everything, it's a scar damn it, I tell you it's a scar..... I think it is a scar, he has lot of those. Got to check that. If it isn't a scar, it might become one now.
Yeah, if there is a lot of metal, I try to do them first, in fear of getting those little metal specks on the model. They are hard to get rid of and can be VERY visible. As you might or might not see now, the green shines through here and there, I applied the white unevenly on purpose. That approach feels a bit unsafe to me, but I don't really think I can go wrong here. Will get most of the detail done first, and then I'll go to town with various washes on the skin.