-------------- Original message from James Maher <deltaflyer@prodigy.net>: --------------

For you guys that have built aluminum wing tanks and are using automotive fuel with ethanol,

which Pro-Seal did you use?

I see two types in the Aircraft Spruce catalog.

One is called Pro Seal P/S 890 Class B ad appears to be a one part sealer.

The other is called Pro-Seal Type tank sealant and is described as a two part polysulfide in a cartridge.

I'm confused.

I am making plans to build an aluminum fuel tank from 5052 sheet.

I think I'd like to use the Pro-seal for the internal flanged baffles that will be rivet in and the sump fittings plate.

The rest of the tank (perimeter) will be joined together by Tig welding.

Which one will hold up to Mogas with ethanol?

Thanks,

Jim