When you say bodywork, is this a one person venture, more than one person working at a time, or otherwise? More than one DA or such tool working at once in the case of a multiple person shop will quickly consume air. The more your compressor runs to keep up, the more heated the air gets and the more vapor that gets in it, making water removal such as Mike described all the more important. The CFM capacity should match the projected work to minimize this effect and any premature wear on the compressor from overuse/overheating.
