So I have an unpleasant slow leak from my bulkhead through the integral overflow. And at this point emptying the tank to dismantle is not really a viable option. I was thinking of putting some kind of sealant inside the overflow to cover the bulkhead itself thus encapsulating and sealing it off. Any recommendations on what to use? I thought about liquid rubber but they say it can’t be poured to any depth so that’s useless.