Stick large flap of fibreglass or reglass?

Hi there,

I am about to repair a snapped eps board. When the board snapped the deck glass remained intact at the snap and stripped off close to the rails all the way up to the nose. There is now bare foam on the deck from the nose across two thirds of the length of the 5’11" board (which is in two pieces), which reaches almost to the rails on the nose piece, and narrows in the tail piece. I have the flap of glass separately which fits fairly neatly crossing both halves.

So my question is: should I just reglass the whole thing or stick down that flap and then glass along the seam? Is there any argument for the latter? I have never glassed such a huge area and it seems too much like making a new board, whereas sticking down the flap feels more like mending one! Also, half of a logo is on the flap, it would be nice to preserve that but it’s not a big deal.

I suspect most will recommend reglassing, if so should I use 2 or 3 layers of (6oz) cloth? And do you recommend I wrap around the rail even where the strip is narrower?
Oh, and will I need to seal the foam or anything like that first?

Thank you in advance for any advice,

Aiden