@ Loup-Garou, when I had to sell my 2 CV, a dull greyish-beige paint that had seen better days, I went to the 
 Citroën dealer and asked for a red colour, something like 
 Rouge Cinabre.  A popular early nitrocellulose lacquer paint in the sixties and early seventies. The smell was, to put it mildly, rather pungent. They asked me, already noticing that I was not a professional car painter: are you going to use a paint sprayer or a paintbrush? Well, it is a sunny afternoon, on the street it will be with a brush. Then we'll put some extra solvent in this tin. Be careful: the painting has to be done in a continuous motion, otherwise your brush will "freeze" in the paint. Message understood and reported it, back from mission, to girlfriend # 2, today still wife # 1. She did an excellent job, car in showroom condition, ready to be sold. 
To cut a long story short: she continued with painting, outside and 
 also inside.
Here Mr. RA is the person to receive some further lessons.