One can easily see how "to cover over" can also be applied to cultic propitiation contexts--sacrifice "covers over" sin.
Mark goes on to point out that the word is found in another unexpected context.
I found it very interesting that the same word is used in Gen 6:14 when the Lord commands Noah to cover the ark with pitch. Strangely enough, the same root is used for the word which means "pitch." Unfortunately, Gen 6:14 is the only occurrence of the word. But the image of God covering over sins with pitch is a powerful one, not that Gen or Ezek actually says that. The Ezek passage is referring to a future time when God will kaphar Judah's sins. I suppose it also has theological implications, but I don't want to take this too far. The point is that we can compare Ezek 16:63's use of kaphar with Gen 6:14 and come up with the image of God covering our sins with pitch. Cool.In fact, Genesis seems to present Noah as a kind of new Adam, with numerous motifs reminiscent of the creation account. As in Genesis 1, in the story of the ark of Noah we see how a new creation emerges out of waters (Genesis 1:2; 7:11). The number “seven” also figures prominently. The flood begins after seven days, evoking the seven days of creation (Gen. 2:2; 7:10). As the Lord rested on the seventh day, the ark comes to a rest in the seventh month (Gen. 2:2-3; 8:4). Noah sends out birds every seven days (8:10-12). Noah was commanded to take seven pairs of clean animals (animals acceptable for sacrifice) into the ark (Gen. 7:2). We might also mention that “Noah” means rest--evoking the Lord's resting on the seventh day of the creation account.
Like Adam, Noah is told to be “fruitful and multiply” (Gen. 2:28; 9:1) and given “dominion” over the creatures of the earth (Gen. 2:28; 9:2). We might also note that the ark is created in three sections (cf. Gen 6:13) corresponding to the three realms of the cosmos created in Genesis 1. The tripartite structure is likely meant to indicate that the ark, like the cosmos, should be seen as a kind of temple [which had three sections: (1) Outer Court, (2) Holy Place, (3) Holy of Holies].
In addition, we might also mention that the downfall of Noah is also reminiscent of Adam’s. Noah ends up in a vineyard, as Adam was in the garden. As Adam ate the forbidden fruit, Noah consumes too much of the fruit of the vine and becomes drunk. He is then found "naked". This results in his issuing prophetic statements about the consequences about what has just happened.
 For a fuller treatment see, S. W. Holloway, “What Ship Goes There: The Flood Narratives in the Gilgamesh Epic and Genesis Considered in Light of Ancient Near Eastern Temple Ideology,” in ZAW 103 (1991): 328-354; Meredith Kline, Kingdom Prologue (South Hamilton: Gordon Cornwell Theological Seminary, 1989), 156-59; C. T. R. Haywood, ‘Sacrifice and World Order: Some Observations on Ben Sira’s Attitude to the Temple Service,” in Sacrifice and Redemption (S. W. Sykes, ed.; Cambridge: Cambridge University Press, 1991), 22-34.