Join Date: Oct 2006
Location: Callao, VA
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Re: Holding tank repair/replacement
any coating that is applied through the holes/vents/inlets of an already used holding tank are of little value. Especially a plastic tank, as few coatings are stout enough to adhere, even to a new plastic tank. Metal tank is already compromised by sewerage, chemicals, rust/oxidation, etc....so that you will be coating the residue at best.
Unless you are dealing with a new tank and can rotate it throughout it's entire possible holding capacity, the coatings are marketing spin.
Your only solution is replacement