Second technique is used for the areas, which are not accessible by INNER technique (pressing out by standard PDR tools). OUTER technique uses the system of stick-on adapters and reverse hammer or tongs. By this technique is possible to get the same quality as by Inner technique, but Outer one is quite slower.
This method is useful when it is impossible or unwished to demount any car body part and in the case of the low range of deformation, when the demounting become needless.
For example, when the car roof is damaged by 5 – 20 dents, up to the diameter of 30mm, we automatically use the Outer technique (sticking) for the repair, without demounting.