seal off unused thru hulls: Epoxy or Polyester?

[jibes138]

I've been using epoxy from US Composites and love it. Every bit as good as WEST and low and no amine blush versions. Current price is $75.50 for 1.5 gallons plus shipping from Florida. (about $23 to Michigan). They also have polyester resin and fiberglass.
uscomposites.com

Might want to try Merton's marine supply, he is an old friend from high school and has a low overhead operation with good prices. He advertises in Soundings.