Replying to Huge topsheet slice

The other day somehow my opposite edge took this huge gash out of my other ski's topsheet on my MTs. Some of the core is exposed even. The sliced part is still there and it lays down nicely, so I just have to affix it back in there. Since it exposes the core though, I'm reluctant to use regular epoxy in case it will soak into the core and mess with it. I do need a moisture seal though to protect the core. Any suggesitons on what kind of glue/epoxy?

'180 net grab = NOT a new trick!'

Have you ever seen a little kid slide back down the inrun of a kicker without going over? This is why parents shouldn't dump their kids off anywhere near the park...