How to fix this?

Then delamination from what I can see can be fixed with any epoxy resin. Make sure it is dry before you put the resin in or it won't adhere well. The substrate that you are bonding to(foam) is weak and will fail before the adhesive will. If you have it covered now with tape that should prevent the water intrusion. I would remove the tape, hit it with a hair dryer apply the resin make a caul plate out of wood covered with Saran wrap of wax paper so the resin squeeze out doesn't stick to the wood. The wood plate would distribute pressure to the repaired area. When I repaired mine I used a car jack against the side or a building to apply pressure. It helps if you put the jacks down first. When finished and sanded maybe a decal covering the area would look nice.