Clogging happens due to resin dust and soft filler buildup. Use open-coat abrasives with anti-loading treatment, and avoid excess pressure. CUMI’s coated abrasives are designed to stay clean longer.

Use a consistent cross-hatch sanding technique and step down through finer grits before moving to polishing compounds. Avoid skipping grits. Finish with a fine buffing abrasive to eliminate micro-scratches.

No. Using the wrong abrasive type for wet sanding can cause grain shedding, delamination, or surface defects. Many garage workers assume dry-use abrasives can be sprayed with water—this leads to early failure and uneven finish.

• Always verify the abrasive is specifically rated for wet or dual-use.
• Wet-sanding abrasives are resin-bonded and waterproof-backed to withstand moisture and maintain grain structure.
  
• CUMI’s water-proof sheet series is engineered for low friction and extended life during clearcoat and colour sanding applications.

Premature wear is often caused by poor filler compatibility or over-application pressure. Heavy body fillers can quickly clog standard abrasives, reducing cutting action. Other causes include low-quality grain bonding and incorrect grit choices for rough shaping.

Over‑sanding is a pervasive issue in bodyshop work. It makes panels and filler areas thin which can lead to adhesion failure and visible defects after painting. 

Best practice:

• Always follow a structured grit progression (e.g., 80 → 120 → 240 → 320).
• Use guide coat or light dust markers to detect uneven areas early.
• Apply consistent, light pressure and let the abrasive do the work—avoid digging in.