Re: tank coating
I've not tried it but a product called Kreem, (I'm not certain about the spelling) seems to be recommended here often. I have a tank project coming up soon so I'll be looking for something too. I understand that Kreem, is available at motorcycle shops. I'm sure someone else will correct me if I spelled the product name wrong.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"