As the parts I had been playing with are all above the "waterline" I wanted to paint them grey to match the other visible parts of the fuselage. So painting now consists of deoxidine, etch primer, three coats of epoxy primer, and two coats of grey paint. This is going to take some time, and so it proved.
The weather is turning colder, and is only just marginally warm enough for painting. The etch primer can be force dried with the hair dryer, but this does not seem to be so effective, so I needed to apply three coats at 15-minute intervals then wait for an hour or two before I could move the parts to paint the other side.
As a result, I completed the etch priming but only got part way through the epoxy priming.
I'm going to have to engage in some forward planning from now onwards!
Picture 1 shows the two parts that make a "toblerone" shaped brace.
Picture 2 shows a selection of superstructure parts for one of the fuselage sides, ready for painting.