So, I earlier mentioned polysulfide sealant is FAA approved for fuel contact in my Lake Amphibian. After making that post I read about automotive fuel tank sealants, there are several.
Certainly they are not so rigorously tested as FAA approved products, but it seems the manufacturer intends those sealants to perform with mogas. They seem reasonable (if not certified) to perform with the mogas fuels. I could not find specific data of those in use in aluminum tanks but I did email their tech support for info on that. jg > >
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