I'm thinking of starting a winter build in another cheap PVC and plastic hoop house, basically unheated.

Anyone have any thoughts about cold-cure epoxy? I don't care if I bright finish, paint is ok.

https://www.systemthree.com/products/cold-cure-cold-weather-epoxy

Don't expect to be wetting out fiberglass down to those temperatures.

They're selling product.

But hey, give it a try. Buy a small amount and do some test panels at different temperatures and you will quickly learn what it can and cannot do. It's better to do some of your own tests in your conditions than to find out this epoxy didn't live up to your expectations on your boat.

Burrrrrrrr!