I'm not sure what brand it was Walt and I no longer have the can but I bought it direct from Vans, in good faith, along with the pre-made fuel pickup tubes. It was shipped separately, some time after the wing kit, so that the use by date would not be expired.
I've just opened up the second tank access panel and it too is like goo inside, both the sealant in the fuel tank and on the pickup tube that was ready made.
There must be other RVs flying around in this condition. The only reason I found out about the internal state was due to opening up the tank for the SB. It seems this type of sealant is not really fit for purpose if it can fail so readily without any indication of the cause.