Answer
Rubber can be sanded only lightly. Use 220 or 320 and stop if it smears or heats up.
Why it happens
Rubber is flexible and heat-sensitive, so abrasive paper can drag and load quickly.
Recommended grit
Use 220 or 320 only for very light shaping. Replace paper when it loads.
Wet or dry
Dry.
Success check
The rubber is lightly shaped without smearing or tearing.
What to do
- Clean the rubber surface first.
- Test with 220 or 320 using light pressure.
- Stop if the rubber smears or heats up.
- Use fresh paper when loading starts.
Avoid: Do not sand rubber with heavy pressure.