Sanding scratch swelling is defined as?

Sanding scratch swelling is defined as?

• A. Scratches caused during sanding
• B. Visible scratches that appear after painting
• C. Swelling due to filler expansion
• D. Scratches that are visible before primer

Answer: (B)

Sanding scratch swelling describes those marks that only show up after the paint is applied and cured. When you sand a surface and leave fine scratches, the primer and paint can reveal or exaggerate those scratches once the color and clear coats go on. The final finish becomes reflective in a way that makes the under-sanded imperfections visible, even if they weren’t obvious during prep. This is different from scratches caused during sanding (which would be seen on the surface before painting) or from filler swelling (which is about the filler itself changing size). It’s also not about scratches visible before primer, since those would appear earlier in the process. To avoid this, ensure thorough, clean sanding with progressive grits and verify the surface under good lighting before applying paint. If such scratches appear after painting, corrective steps usually involve scuffing and refinishing the affected area and reapplying paint as needed.

Sanding scratch swelling describes those marks that only show up after the paint is applied and cured. When you sand a surface and leave fine scratches, the primer and paint can reveal or exaggerate those scratches once the color and clear coats go on. The final finish becomes reflective in a way that makes the under-sanded imperfections visible, even if they weren’t obvious during prep.

This is different from scratches caused during sanding (which would be seen on the surface before painting) or from filler swelling (which is about the filler itself changing size). It’s also not about scratches visible before primer, since those would appear earlier in the process.

To avoid this, ensure thorough, clean sanding with progressive grits and verify the surface under good lighting before applying paint. If such scratches appear after painting, corrective steps usually involve scuffing and refinishing the affected area and reapplying paint as needed.