How can sanding scratch swelling be prevented?

• A. Using extra coarse grit throughout
• B. Sanding in a circular pattern
• C. Using proper sanding techniques and grit progression
• D. Skipping sanding steps

Answer: (C)

Preventing sanding scratch swelling comes from using proper sanding techniques and a careful progression of grits. Start with a grit that level-sets the surface without digging in, then move through progressively finer grits in small, even steps. This gradual blend minimizes heat buildup and keeps the scratch edges from lifting or widening. Use a sanding block or a dual‑action sander to keep pressure even and avoid creating new gouges or circular swirls. For heat control, keep the surface cool—wet sanding or frequent wipes to remove dust and residue helps—so you’re not softening or smearing the material. Maintain light, consistent strokes and check your work often to ensure the scratches are diminishing rather than growing. Skipping steps or jumping from very coarse to very fine without intermediate grits tends to leave or create swollen edges; likewise, sanding in a careless circular pattern can embed heat and create swirl marks. By applying the right technique and a thoughtful grit progression, you achieve a smooth, uniform finish ready for subsequent coating.