D main culprit for painters are d dust...oven or even a proper spray booth is good enuff...d only difference between d 2 is again d cost factor...an oven can cost about 30k new (used I've seen selling at 18k)..a proper designed n built spray booth does d job for a fraction of d cost...as long as d vacuum n fan is put up properly to suck out n minimize d dust then half ur work is done...d rest nothing a good polish n wax x do..