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Problem

Can I sand Trex decking?

Trex or similar composite boards can show permanent color or texture mismatch after sanding.

drywall patch dry sanding scratches
Answer

Do not sand Trex decking for normal scratches. Follow the maker's repair guidance and test hidden areas only.

Why it happens
Capped composite decking has a surface layer that can be damaged by abrasive sanding.
Recommended grit
Do not sand Trex decking for normal scratches. Test hidden areas only if repair instructions allow it.
Wet or dry
Dry.
Success check
No visible board area is damaged by sanding.

What to do

  1. Clean the board first.
  2. Do not sand normal visible scuffs.
  3. Follow the decking maker's repair guidance.
  4. Test hidden areas only when sanding is allowed.
Avoid: Do not use coarse grit on capped composite decking.

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