No idea, all I have is the tag on the back and what be a model number of 13199Is that a ---Lightning----sailboat ?
Yes it seems to be two fairly thin layers of fiberglass, with a piece of foam sandwiched between themIt would be best if you can get to it from the inside, but you probably can't. For a hole that size, you'll at least need to fill it with thickened resin before it's glassed. If it gets any bigger from grinding, you might need a more solid backer.
Fiberglass repair guide ready for review.
Fiberglass Repair Walkthrough ( Mods, since this is so large, I'm going to try to post roughly half of this as a reply. I don't know how well it will work, so please wait until I'm done before commenting.) Introduction I've been repairing boats for almost 12 years at this point. I've only...forums.iboats.com