The Biblical Flood as described in the kinda merged collection of flood myths in Genesis 6&7 never happened and so discussion of whether the the Ark would float is about as reasonable as discussing how the Millennium Falcon made the Kessel Run in "less than twelve parsecs".
It can be fun but when dealing with fantasy like the Biblical Flood and the Ark most anything is possible.
Anyone so limited that they can only spell a word one way is severely handicapped!
"God told the patriarch to coat the ark, both inside and out, all 229,500 square feet of it, with pitch, and, in fact, this was a common practice in ancient times. But when Noah hurried to the corner hardware store, the shelf was bare, for pitch is a naturally occurring hydrocarbon similar to petroleum (Rosenfeld, p. 126), and we know that oil, tar, and coal deposits were formed when organic matter was buried and subjected to extreme pressure during the flood (Whitcomb and Morris, pp. 277-278, 434-436), so none of it existed in the prediluvian world. Morris (1976, p. 182) tries to say that the word for "pitch" merely means "covering," but not only do all other Bible dictionaries and commentaries translate it "pitch" or "bitumen," but creationist Nathan M. Meyer reveals that all the wood recovered by arkaeologists on Mt. Ararat is "saturated with pitch" (p. 85). Thus it seems that God accommodated Noah by creating an antediluvian tar pit just for the occasion, and we have another miracle."