The large kerosene heater purchased to warm the garage did the trick of getting the surfaces nice and warm, although the heater can't be left on all day as it consumes a lot of kerosene. Three quarters of an hour heated the garage to 20oC.
Just the roof top was painted, as I think I'll do the sides once its on the body again. That will give better access to the surfaces, and will also put the sides at a nice height for painting. It may also be easier to take the side windows out from there.
Below, the newly-Limestone-coloured roof top drying, with a small electric heater on the floor in front, the orange glow of which can be seen reflected in the paint. This to keep the aluminum warm while the paint dries. The heat is also causing the plastic sheeting, there to protect the windows, sides and insides, to lightly inflate, due to the coldness in the garage.
