Hi Rob, I treated my Fuel Tank internally with this product. http://www.fertan.com/products.../tapox-tank-sealing/
I used 2 kits (2x500ml mixed) and that was just enough. It is nasty 2 component stuff so Gloves and Mask is recommended ;-) My tank was not bad with rust before the treatment but just to be sure I left it overnight filled with a rust remover agent from same supplier and the Tank was completely clean afterwards. It looked like brand new on the inside. The treatment also changed the acoustic of the Tank. It does no longer sound like a Church Bell so the Epoxy Sealer must absorb the noise. The exterior of the Tank was painted with 2 component silver Epoxy.
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