Some modern paint finishes are susceptible to marring no matter how carefully they are treated, and drying them off after washing poses two key problems. Firstly, there is always the danger when working outside that fresh airborne contaminants may settle on the car after rinsing off. Wiping the car dry with a microfibre drying towel can result in such contaminants causing marring as they are trapped by the towel and drawn across the bodywork. Secondly, as paint is dried off, all lubrication is effectively removed, meaning that the friction between the towel and the bodywork increases. This in itself can be enough to cause marring on some paint finishes.
The solution to both problems outlined above is to cut out any wiping of the paint. It is possible to pat dry a car using a microfibre drying towel in only a little more time than that required to wipe it dry. By not wiping, any fresh contaminants are not moved around over the paint and towel friction is kept to a minimum. A further option that significantly reduces the need for any towel contact with the paint is to use an air blower to dry the car off. Dedicated vehicle dryers work extremely well in this respect (better than leaf blowers and vacuum cleaners with blower functions) and virtually eliminate the risk of inflicting fresh marring altogether.
A tool like the MetroVac Air Force Blaster is certainly an indulgence, but it works incredibly well and vastly reduces the risk of inflicting paint defects during the drying process. With a bit of imagination, it can serve many other useful purposes too; we use ours not only to dry our cars, but also to blast polishing dust out of door shuts and vents, and to blow dust and other detritus out of interior vents and seat runners. Combine this with the rock solid five year warranty it comes with and the smile it will put on your face every time you use it, and it becomes a priceless bit of kit to own. Who says you can't have fun when detailing your car?!