In my opinion, POR 15 is a last ditch effort to salvage a rusty fuel tank that can't economically be replaced. I have read too many horror stories about the POR 15 flaking off and causing more problems.
If your baffles are loose (they all are) and you put POR 15 in there, the POR 15 will try to glue the baffles in place but it will not be strong enough and movement will start peeling the POR 15.
Has the glue in your tank been causing you problems? The better option is to replace the tank with an aftermarket aluminum tank.