Spraying with aerosols in this weather invariably gives poor results, so many years ago now, I had an idea. Even a full can on a cold day will benefit from the hot water treatment. Obviously, as it is full, a small amount of hand hot water in a jug - just enough to float the tin - is sufficiuent. Take out & shake regularly to ensure even temperature spread. Spray until the tin is half empty. Stand the tin in the jug again & pour in enough hot water to float the tin again. Me, I use boiling water at this stage.
When spraying, wrap the tin in a cloth to preserve your poor shrinking flesh & keep the tin as hot as you can as it will cool rapidly as the paint expands out of the nozzle.
It is also a useful trick in clearing otherwise unclearable nozzles when the tin is annoyingly half used.
Whilst adding that there is obviously some danger in doing this, I bet the manufacturers build in a safety margin! I have been doing this for at least ten years, entirely without incident and have found, it gives a very considerable increase in pressure, the paint is thinner at the nozzle & application is more positive, especially in less than ideal conditions of temperature & humidity.
Finally, I suppose I ought to end by saying (excuse the capitals) DON'T USE NAKED FLAMES!
Usual disclaimers.
Regards,
Kim