Good to know.I've done a lot of boat repair, and if you use epoxy, vs polyester resin, and it's prepped well, I can guarantee it will NOT pop off.
The thing is, that a body like that is probably wrapped in bleeder cloth and vacuum bagged over a mold.
That squeezes all the excess resin out, and compresses the cloth layers tight together, making it strong, but also light as possible.
If you can't do that, then you wind up with a bulkier, heavier layup - It can be as strong, but it won't be as light.