Originally Posted by
Salty87
that decision is very much like the ply vs lumber choice...personal preference.
the factory used poly so there's a line of thought that epoxy is overkill and $$$$.
however, epoxy creates a stronger bond to old fiberglass. if you prep the surfaces good enough, shouldn't be an issue.
with poly, you must lay down chopped strand mat (CSM) before the cloth or it won't wet out properly. some of the new fancy weaves incorporate mat into the cloth.
i used 20 or 25 gallons of poly on a total rebuild. it was my first big glass'n project so there was some waste.
edit: checked out the roll of glass i have leftover. it's 36" wide, something like 6 oz, and there must be 10 or 15 lbs on the roll. i used it for the top and bottom side of the floor, not sure what else i used it on. what's your zip?