Oh, ok cool. Thanks. I've worked with caulk, but only the silicone type for plumbing and making cute phone cases. E6000 is great for abs, cause if you mess up you can pull it apart or even cool it in the freezer (it becomes really brittle).
I second the dirt! I have Sandtrooper armor, so I'm bias when it comes to being dirty. Fuller's Earth is great for weathering! A little goes a long way too.
I'm new to the armor building too :) I've seen on many threads that if this is your first time doing pepakura, try with something smaller to get the hang of it. I have made one mask for different cosplay out of pepakura, just haven't fiberglassed it yet.