Where does “lieterappaus” come from?

lieterappaus (Finnish) comes from Finnish rappaus, from Finnish räpätä, from Swedish rappa, from German berappen.

lieterappaus (Finnish): skimming, skim; applying a single coat of plaster; a render with a single coat of plaster

Definitions

skimming, skim; applying a single coat of plaster; a render with a single coat of plaster

lieterappaus traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Finnish	rappaus	plastering covering of plaster
2	Finnish	räpätä	to rap; to tap, hit lightly; to get it
3	Swedish	rappa	to rap; to speak lyrics in the style of rap music
4	German	berappen	—

Step	Language	Word	Meaning
1	Finnish	liete	silt; sludge; slurry
2	Proto-Finnic	leet'ek	fine beach sand