Sunk-in patches: dull spots where oil sinks into the ground
“Parts of my painting have gone chalky and dull, while other areas are still glossy.”
What is happening
Certain areas of the finished painting look flat, dry, and sunken, while neighboring patches retain a rich, lustrous shine. The darks in the sunken areas appear pale and dusty.
Oil from the top paint layer has been absorbed down into an overly porous primer or a lean, underbound underlayer. Without the glossy oil binder to seal the pigment on the surface, light scatters irregularly, making values look weak.
The 30-second test
Look across the painting against an angled light: if the surface sheen switches erratically between glossy and matte patches, you have sunken-in passages.
How to fix it
- Allow the painting to dry thoroughly to the touch.
- Take a small amount of painting medium or refined linseed oil on a clean lint-free cloth or soft brush.
- Oiling out: wipe a very thin film of medium over the dull sections until the gloss matches the surrounding paint.
- Gently wipe off any excess oil with a dry cloth so no sticky residue pools on the surface.
Can it be saved? Rescue
A standard oiling out procedure restores the lost binder to the surface and revives the depth of the sunken colours.
Drill: Oiling Out Test Board
About 15 minutes. You need:
- dry patchy test panel
- linseed oil or oil medium
- lint-free cotton cloth
Take a completely dry study panel with matte sunken patches. Rub a small drop of medium over the boundary between the glossy and matte regions, then buff it until the entire passage has a unified sheen.
Background reading
General teaching sites on this subject. They are a reading list, not page-level citations for this advice.
The advice is a generated synthesis of common teaching practice and has not been checked line by line against any source; treat times and difficulty as estimates.