Answer
For plastic kayak scratches, sand only rough raised edges with 220 or 320, then blend with 400 or 600.
Why it happens
Most kayak plastics are soft and abrasion-resistant, so sanding should be limited to repair blending.
Recommended grit
Use 220 or 320 for rough gouge edges, then 400 or 600 for smoother blending.
Wet or dry
Wet for finer stages.
Success check
Raised scratch edges are blended without thinning the plastic too much.
What to do
- Clean the scratched area.
- Sand only raised or rough gouge edges.
- Use 220 or 320 lightly.
- Blend with 400 or 600.
Avoid: Do not sand the full kayak hull just to remove normal scuffs.