You can also use fiberglass. Depending on size and location you may want to consider if flex or weight is gonna be affected by how much material you add.
IMO the only thing you are worrying about on the top sheet is waterproofing the core. Keep in mind shit will want to pop out when it gets cold and flexed.
If remotely un confident and the board is new/nice, I'd support my local repair guy.
(a little dab of construction adhesive in the hole maybe, that shit is bomber.)
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Last edited by snowklinger; 01-03-2016 at 09:49 AM.