Which statement about sanding scratch swelling prevention is true?

Which statement about sanding scratch swelling prevention is true?

• A. It can be prevented by using only the finest grit
• B. It is prevented by using proper sanding techniques and grit progression
• C. It cannot be prevented
• D. It only happens with rust

Answer: (B)

Sanding scratch swelling is controlled by using proper sanding techniques and grit progression. If you try to fix everything with only the finest grit, you won’t effectively remove deeper scratches and you may create a dense field of micro-scratches that heat up and swell when you apply a coating. The key is a deliberate progression of grits—from a suitable coarse grade to progressively finer ones—so deep imperfections are removed first and the surface is refined without creating heat buildup. Use light, even pressure, keep the pad flat, and move in a consistent pattern; keep the surface wet or use light lubrication to prevent loading. This approach yields a smooth, uniform base less prone to scratch swelling when you apply the next layer. Swelling isn’t limited to rust; it can occur on any material if technique is poor.

Sanding scratch swelling is controlled by using proper sanding techniques and grit progression. If you try to fix everything with only the finest grit, you won’t effectively remove deeper scratches and you may create a dense field of micro-scratches that heat up and swell when you apply a coating. The key is a deliberate progression of grits—from a suitable coarse grade to progressively finer ones—so deep imperfections are removed first and the surface is refined without creating heat buildup. Use light, even pressure, keep the pad flat, and move in a consistent pattern; keep the surface wet or use light lubrication to prevent loading. This approach yields a smooth, uniform base less prone to scratch swelling when you apply the next layer. Swelling isn’t limited to rust; it can occur on any material if technique is poor.