In Genesis, Noah’s Ark was covered with pitch inside and outside.
Genesis 6:14 instructs Noah to make the Ark from gopher wood, build rooms in it, and cover it with pitch within and without. Pitch refers to a waterproofing substance, traditionally understood as bitumen or another tar-like material. The verse does not specify its chemical composition or explain how Noah obtained it.
The instruction is important because it gives the Ark a practical sealing treatment on both sides. It is separate from the timber named in the same verse and from the Ark’s dimensions in Genesis 6:15. English translations vary in wording, using terms such as pitch, bitumen, or tar, but “pitch” is the conventional concise answer. The passage does not describe a modern paint system, metal plating, or a particular industrial product.