[Bigblockdude]

Ok, I got this bitchin digger last week. The tank is fucked up inside. 20 year old gas, and tank sealer. The rust is flaking and bubbling under the layer of deteriorating sealer. I need any suggestions of what has worked to remove this crap and reseal it.
Any and all suggestions are appreciated.

 

[Bigblockdude]

I've cleaned tanks using acid, but none have had the sealer in them.
I'm going to fill it with vinegar saturday and see what happens.