yet another goo question

Our build hasn't begun officially yet, but we've been studying plans and reading lots of threads here on the forum and a black goo question has come up.
Is it a good idea to put the black goo on the bottom edges of the sides of the tear before you attach the sides to the deck?
I know many people talk about how to spread the goo on the deck, but don't recall any mention of the need to protect (waterproof) those bottom edges.
Any help would be much appreciated. Thanks, Susan
Is it a good idea to put the black goo on the bottom edges of the sides of the tear before you attach the sides to the deck?
I know many people talk about how to spread the goo on the deck, but don't recall any mention of the need to protect (waterproof) those bottom edges.

Any help would be much appreciated. Thanks, Susan