hi mal im using 2k paint from a local supplier as for spray guns ive been using 3 different one i started with a devilbiss but its been playing up could do with an overhaul ,i bought a sip hvlp the same make as my compressor which ive used for priming it has a 1.4mm nozzel which was great for priming putting plenty of paint on im just a bit worried when using it for the base coat incase i can't get it spraying fine enough,as for the stripes i bought a little draper touch up gun with a 1mm nozzel .this is a lovely little gun i would use it to spray the base coat on but with such a small bottle ill be for ever refilling it and it does seem to creat a dust cloud, the compressor is a sip 150litre so is good to run a breathing mask off as well as the spray gun (full on extraction?) i take it you mean do i leave a window open to clear the air