Reddo said..
Great thanks. Trouble is we have six weeks left of the trip. Is the tape still the best option (then dry it at home) or do I just bite the bullet and fix it now with epoxy and matting?
If by that you mean chopped strand mat? Then no no no - most chopped strand is designed for polyester and does not work well with epoxy due to coatings or binder or some rubbish in it. You want proper 4oz (ish) plain weave or satin weave fibreglass cloth. Forget anything about boat repair or Bunnings stuff
If its dry now, a good option is epoxy Knead-It or similar to fill it up as it sets really hard. When you get home you can grind it back (along with that displaced glass) to get levels right then go over the whole thing with a couple of layers of glass.
There are a lot of board repairs people bring to me that have Knead-It and its so tough that if its not a massive amount I do leave it there quite often and just glass over and fair it off.