What is a common mistake in dent repair according to technician guidelines?

Drilling holes in panels is considered a common mistake in dent repair because it can compromise the structural integrity of the vehicle's body. Holes can create weak points in the metal and may lead to further damage or rusting over time. Additionally, this practice can make it more challenging to restore the panel to its original condition, affecting the repair's overall quality and appearance. Therefore, skilled technicians are trained to use alternative techniques that do not involve drilling, ensuring the panel remains intact and the repair process is both effective and efficient.

While other choices mention practices that can also lead to poor repair quality, they do not have the same immediate detrimental effects that drilling creates in terms of structural integrity and long-term consequences for the vehicle.