According to Spectra, don't worry about it. It's impregnated in the tank.
They also say do not use any type of gas tank sealer. It will not adhere and it will gum up your fuel system.
Here's what I found on the net in a mopar forum:
As everyone is aware of, I had a new tank from Spectra and sealed it with Bill Hirsch ethanol resistant sealer. Yesterday I
started to set the new tank under the car and a tiny white particle drifted out of the sending unit hole.The sealer had all come
loose from the inside and was nothing but bits and pieces about the thickness of toilet paper. I talked to Hirsch and they hadn't had this problem. So I called Spectra(1-800-565-5524), told them my problem and they informed me that new tanks
are manufactured with a corrision resistant type oil right in the metal and they say NOT to use any type of fuel tank sealer
(no matter how good a product) in their tanks. The sealer will not adhere to the inside of the tank with anticorrision material in the metal . This anticorrision material is not just a coating on the metal, but is impregnated into the metal when the new
tanks are stamped out.
To make a short story or tale even longer. If you get any Spectra fuel tank, do not seal it period.
Incidently all Spectra tanks are warranted up to 20 years using ethanol E20 or less. The company spent over 10 minutes on
the phone explaining all this to me and it was nice to talk to a company that actually gives a damn!
The only bright spot here is that I "discovered " all the sealer loose in the tank before I installed it and put gas in!