Keep a jug of warm water nearby and dunk the can in when you take a break between use. Just dry the can afterwards! I use a similar trick with power cans for air brushes as it gives a better and more balanced pressure (phyics 101 - when you release the gas, the pressure and the temperature of the ca...
I recently bougght some of these, not necessarily for use on Gundam models but generally for detailing panel lines. Got the black, grey and brown panel line pens plus colour set and blender. Generally for pannel lines I use either a rotring ink pen with thinned black ink or a thin acrylic paint, the...