You can see the weave under this first layer of epoxy on fiberglass. You’ll have to completely fill that weave before you’re ready to flip the canoe. You’ll also need to shape down the fiberglass where you tucked it in over the other side of the canoe. It’ll take some, wait for it… sanding! You’re looking to make a mechanical bond. Basically, you’re preparing the weave to accept more epoxy but it won’t completely bond if you don’t sand it down a bit. You’re not trying to sand down the weave, just enough so the next layer of epoxy sticks.