Re: Pressure Tank Leaking Home › Forum › Ask A Member › Pressure Tank Leaking › Re: Pressure Tank Leaking frankrUS Member - 1 Year (includes $3 online payment fee)Replies: 6715Topics: 51 May 22, 2018 at 12:02 pm #76556 You only need a drop, so whatever you have on hand, as long as gas doesn’t dissolve it.