Aluminum Gas tank coating

[bertram 20]

Hey guys I just ripped out a fiberglass Ethanol safe fuel tank in my 28fbc it was doing strange stuff to my gas like turning it brown and engines did not like that so I a had a aluminum tank made I want to coat it with something before it goes in. what about 3m Undercoating that you would get a say autozone in a can or is there something better?I was also thinking of taking tank to local LINE X bedliner store and get a price would like to keep cost as low as possible but wanted to get your opinions thanks mike

[Pete Fallon]

Bertram20,
They make a 2 part epoxy (coal tar coating) that is widely used in the boat building industry, also if your foaming it in place make sure you use the 4 pound density foam not the 2 pound stuff, the 4 pound doesn't allow as much water intrusion into the foam and between the stringers and the bottom of the tank. Make sure you have a couple of strips of PVC or hard rubber between the bottom of the tank and the hull to allow water to pass underneath the tank.
Pete Fallon

[Carl]

When I looked into a coating for my tank, Coal tar Epoxy was the item most people I respect recommended..so I went with it.

http://www.mcmaster.com/#coal-tar-epoxies/=tcz6bj


The link says it can be brushed on...LOL. Maybe if I was using a porcupine brush...
I used a large spatula and frosted the biggest aluminum cake you ever saw.

The stuff stinks and dries slow. I have nothing to gauge it against for longevity...but can say the stuff shows no sign of deterioration after several years.
Then again I can only see where I can see and not the so important bottom.

Carl