What kind of damage can result from improper use of a pneumatic sander?

Improper use of a pneumatic sander can indeed lead to indentation or warping of body panels. This occurs because pneumatic sanders operate at high speeds and can easily remove material too aggressively if not controlled properly. When too much pressure is applied or if the sander is left in one spot for too long, it can create uneven surfaces or distort the panel's shape, leading to permanent deformation.

While other types of damage, such as cracking of paint layers or increased surface roughness, can also occur in relation to sanding techniques, they are generally less severe and do not affect the structural integrity of the vehicle like warping can. Dust accumulation on the vehicle surface can be a byproduct of sanding but is not a direct result of improper use of the sander itself. Therefore, the most significant consequence linked to the misuse of a pneumatic sander in this context is indeed the warping or indentation of the body panels.