David I have a roll of the normal stuff but I also have a length of Trakmark that looks identical but is self-adhesive. But given the time since it was manufactured I suspect it will be as about as effective as these modern self-sealing envelopes (bring back proper gummed envelopes!)
Andy I only have experience of the paint on Hornet & 2 Pigs but these show no evidence of a primer, but they were painted in 1960s-70s. The two-coat system occurs in all the COSAs I have 1980, 1983, 1986, 1993, 1996. I don't know what earlier products were, but I had assumed it was paint it twice because it is difficult to cover bare metal.
Wood is the worst, some of the guides in the Hornet's missile tray were wood & for the 14 years I had it, the paint had not set!
A trap for the unwary is that there is a two-pack (rather than two-coat) aluminium paint that has primer, undercoat, finishing coat for the protection of internal metalwork on heavy duty vehicles, including amphibians that has no stated flame resisting properties.