I'm a ways off painting anything yet but will be thinking hard about what to use when the time comes!
Mental note: When doing a seam on a bit, don't just run the iron along in one go, let the first part go solid first. Tacked the bunker back on, spot on position, then when I ran the seam it promptly fell off and I've ended up with a huge mess to clean up putting it back on. Ugh!
For the curved top of the bunker back I tried to fill the gap flush with solder but it just kept wicking away so will try some lower temperature stuff later on, failing that, milliput time...