ew. layer of paint

IMHO malatura w tym wypadku to warstwa farby

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malatura ż IV, CMs. ~urze; lm D. ~ur
1. «malowidło; malowanie, sposób malowania»
Sufity i ściany pokryte malaturami.


2. rzad. «farby użyte do malowania»

icon restoration
... area). 2. Before icon restoration (detail of the damaged paint layer).
3. Before icon restoration (back side of the framed icon). ...
www.patinapal.com/main-workGreekIcon.html

ICON RESTORATION
... different centuries hidden under the fresh layer of paint. ... and which fragments of
the icon are still ... Reconstructing the damaged fragments of icons, Russian and ...
www.rollins.edu/Foreign_Lang/Russian/resto.html

HTH