> I'd bet that there are absolutely zero carried-in-tanks-on-rockets toxins which are barnacle-friendly. Plenty of rockets have used hydrogen as a fuel, and mo

> I'd bet that there are absolutely zero carried-in-tanks-on-rockets toxins which are barnacle-friendly. Plenty of rockets have used hydrogen as a fuel, and most rockets carry tanks of oxygen. These would be gone just about as soon as a hole appears in the tank, but the traces would probably be considered barnacle friendly.