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Problem

What grit removes caulk residue?

Old caulk residue can remain after scraping.

paint dry sanding clogging pressure
Answer

Scrape caulk first. Sand hard residue with 180 or 220, then use 320 before paint.

Why it happens
Flexible caulk can smear and clog paper, so most of it should be removed before sanding.
Recommended grit
Scrape first, then use 180 or 220 on hard residue. Use 320 before paint.
Wet or dry
Dry.
Success check
The surface is smooth with no raised caulk residue.

What to do

  1. Remove bulk caulk with a scraper first.
  2. Sand remaining hard residue with 180 or 220.
  3. Refine with 320 before painting.
  4. Clean dust before applying new caulk or paint.
Avoid: Do not sand thick flexible caulk directly.

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