Answer
For wicker, sand only rough spots lightly with 220 or 320 before painting.
Why it happens
Wicker has woven fibers and tight curves that are easy to damage with coarse grit.
Recommended grit
Use 220 or 320 very lightly only on rough spots before painting.
Wet or dry
Dry.
Success check
Rough spots are smoother without broken or flattened fibers.
What to do
- Clean the wicker first.
- Sand only rough spots lightly with 220 or 320.
- Use a small folded piece for tight areas.
- Remove dust before paint.
Avoid: Do not sand across woven wicker aggressively.