Free PDR Surface Preparation & Finishing Questions and Answers

Question 1

Why is surface preparation important before dent repair?

Accepted Answer

To clean and smooth the area for effective repair

Answer

Proper surface preparation, including cleaning and sometimes light sanding, is essential before PDR to ensure optimal adhesion for glue pulling and to prevent contaminants from interfering with the repair. A clean, smooth surface allows technicians to accurately assess the dent and ensures tools can work effectively without scratching or damaging the paint. This step is critical for achieving a high-quality, undetectable repair.

Question 2

Which material is commonly used to clean surfaces before repair?

Accepted Answer

Isopropyl alcohol

Answer

Isopropyl alcohol (IPA) is commonly used in PDR for surface preparation because it is an effective degreaser and evaporates quickly without leaving residue. It helps to thoroughly clean the dented area, removing waxes, oils, and dirt, which is crucial for proper adhesion of glue tabs and for clear visibility during the repair process. A clean surface ensures the best possible repair outcome.

Question 3

What is the purpose of sanding during surface preparation?

Accepted Answer

To smooth and level the surface

Answer

In the broader context of automotive repair, sanding is primarily used to smooth and level surfaces, preparing them for subsequent steps like painting or blending. While PDR aims to avoid sanding the original paint, surface preparation might involve light sanding in specific situations to address minor imperfections or ensure proper adhesion for certain repair materials, creating a uniform base.

Question 4

Why should dust be removed before finishing?

Accepted Answer

Dust causes defects and adhesion problems

Answer

Dust particles create an uneven surface, leading to imperfections like 'fish eyes' or 'pinholes' in the final paint or clear coat. More critically, dust acts as a barrier between the surface and the new coating, significantly reducing adhesion and potentially causing the finish to peel or chip prematurely. Removing dust ensures a smooth, durable, and high-quality finish.

Question 5

Which tool is commonly used to remove dust from surfaces?

Accepted Answer

Tack cloth or compressed air

Answer

Tack cloths are specially treated cloths designed to pick up and hold dust particles without leaving residue, ensuring a perfectly clean surface. Compressed air is effective for blowing dust out of crevices and hard-to-reach areas. Both methods are crucial for achieving a pristine surface before applying paint or other finishes, preventing defects caused by trapped dust.

PDR - Paintless Dent Repair Technician Certification Practice Test

PDR - Paintless Dent Repair Technician Certification Practice Test

Free PDR Surface Preparation & Finishing Questions and Answers