dob: "To daub" always has the meaning "to cover," "to smear with" in the Scriptures. Ezekiel compares the flatteries of the false prophets to a slight wall covered with whitewash (literally, "spittle"). See Eze 13:10, 22:28. In Ex 2:3 "daubed it with slime and with pitch" (Hebrew wattachmerah, denominative of chemar, "bitumen" or "asphalt"), "to daub" has the same meaning as in the Ezekiel passage.
The International Standard Bible Encyclopedia
Daub
The International Standard Bible Encyclopedia, James Orr (1915). Public domain, from the CrossWire SWORD module.