O.K. you f/g experts, I need some help.

[Billybob]

As some of you may recall, I ripped a piece of skin off the bottom of my 23 last fall.It's about 16" wide by 20 feet long right down to the roving.It's finally warmed up enough to get to this and I'll take pics once I get it off the trailer.
My question is, what do I order to repair this?
First, what weight mat do I need?
Poly or epoxy? The guys at the boat yard insist poly because that is what they used originally. I'm kinda leaning toward epoxy because it's a big area and the epoxy gives you more time before it kicks. But, I don't want any incompatability issues.
Between layers, do I need to layup within a certain time period with either system - or will I need to sand and wipe between?
Your favorite source to order from would help too.
Thanks,
Bill