Ziebart is another good treatment, they've been in the game since the 60's, I remember seeing a 1968 Volvo Amazon in the early 90's that was Zeibart treated from new. A full 25 years later the condition was amazing, the Zeibart treatment had kept the chassis and panels completely rust free, further proof the 'treatment from new' approach is best.
My MGB was Ziebarted from new. 43 years later and although a few areas will need some work in the coming years, the majority of the shell is in excellent condition for the age.
