An user Polish
says…

Pumeks
Noun
  jest
Auxiliary
  tu
Adverb
  niczym
Subordinating conjunction
 — wygładza  powierzchownie
Adverb
.

Pumice is nothing here — it smoothes superficially.
Words and sentences
New
pumeks

pumice

New
jest

  1. third-person singular present indicative of być; is
  2. is, equals (see also wynosi)

New
tu

New
niczym

New
powierzchownie

superficially, cosmetically

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