What is significant about the pitch that Noah used to cover the ark?

Genesis

“Make yourself an ark of gopher wood; make rooms in the ark, and cover it inside and outside with pitch.” (Gen 6:14).  The pitch was a substance used to waterproof the ark.  The Hebrew word used for pitch, Kopher (Strong’s #3724), is from the root word used for “atonement” or “covering.”  The ark is symbolic of how people “enter the door” to be saved by Jesus (John 10:9).  Jesus atoned, or “covered” our sins on the cross, just like the pitch covered the ark and protected the people and animals inside from the waters of judgment.

Jesus covered our sins, just like the pitch covered the ark.